From 8ab04a990913a5065dff6e8988f7633ff1126660 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=9D=A8=E6=97=AD=E4=B8=9C?= <1875779940@qq.com> Date: Thu, 26 Oct 2023 19:10:20 +0800 Subject: [PATCH 1/2] =?UTF-8?q?=E6=9D=A8=E6=97=AD=E4=B8=9C=E7=9A=84?= =?UTF-8?q?=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...72\347\241\200\351\203\250\345\210\206.md" | 161 ++++++++++++++++++ 1 file changed, 161 insertions(+) create mode 100644 "55 \346\235\250\346\227\255\344\270\234/20231026javascipt \347\232\204\345\237\272\347\241\200\351\203\250\345\210\206.md" diff --git "a/55 \346\235\250\346\227\255\344\270\234/20231026javascipt \347\232\204\345\237\272\347\241\200\351\203\250\345\210\206.md" "b/55 \346\235\250\346\227\255\344\270\234/20231026javascipt \347\232\204\345\237\272\347\241\200\351\203\250\345\210\206.md" new file mode 100644 index 0000000..5eca7c4 --- /dev/null +++ "b/55 \346\235\250\346\227\255\344\270\234/20231026javascipt \347\232\204\345\237\272\347\241\200\351\203\250\345\210\206.md" @@ -0,0 +1,161 @@ +# Day01 作业布置 + +## 一. 完成课堂所有的代码 + + + +```javascript + + + + + + work + + +百度一下 +mmm3 + + + + + + +const google = document.querySeletor(".google") +google.onclick = function(){ + alert("都憋说奥") +} +``` + + + +## 二. 简单聊聊JavaScript的历史(自己的话术来总结) + +| | | | +| ---------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ | +| JavaScript作者是Brendan Eich | | | +| | [40](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_40) | | +| | [41](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_41) | 刚开始并不是叫这个名字，在Navigator2.0 beta 3版本正式重命名为JavaScript，当时是为了给这门语言搭上Java这个热词；主要就是蹭热度 | +| | [42](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_42) | | +| | [43](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_43) | 在Navigator2.0 beta 3版本正式重命名为JavaScript，当时是为了给这门语言搭上Java这个热词； | +| | [44](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_44) | | +| | [45](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_45) | 借鉴C语言的基本语法； | +| | [46](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_46) | | +| | [47](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_47) | 借鉴Java语言的数据类型和内存管理； | +| | [48](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_48) | | +| | [49](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_49) | 借鉴Scheme语言，将函数提升到"第一等公民"（first class）的地位； | +| | [50](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_50) | | +| | [51](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_51) | 借鉴Self语言，使用基于原型（prototype）的继承机制。 | +| | [52](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_52) | | +| | [53](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_53) | 1996年11月，网景正式向ECMA（欧洲计算机制造商协会）提交语言标准。 | +| | [54](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_54) | | +| | [55](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_55) | 1997年6月，ECMA以JavaScript语言为基础制定了ECMAScript标准规范ECMA-262; | +| | [56](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_56) | | +| | [57](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_57) | ECMA-262是一份标准，定义了ECMAScript; | +| | [58](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_58) | | +| | [59](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_59) | JavaScript成为了ECMAScript最著名的实现之一; | +| | [60](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_60) | | +| | [61](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_61) | 除此之外，ActionScript和JScript也都是ECMAScript规范的实现语言； | +| | [62](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_62) | | +| | [63](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_63) | 所以说，ECMAScript是一种规范，而JavaScript是这种规范的一种实现。 | +| | [64](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_64) | | + + + +## 三. 说说你对JS引擎的理解(自己的话术总结) + + + +| | | | +| ------------------------------------------------------------ | ------------------------------------------------------------ | ------------------------------------------------------------ | +| 首先呢我认为JavaScript是一个非常随便的语言，别的语言不敢做的 我js直接乱杀 | | | +| | [68](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_68) | | +| | [69](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_69) | 排版引擎（layout engine），也称为浏览器引擎（browser engine）、页面渲染引擎（rendering engine）或样版引擎。 | +| | [70](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_70) | | + + + +## 四. JavaScript的交互方式有哪些？(后两种方式) + +4 alert ,document.write,console.log() prompt + +| alert就是弹出一个窗口，可以理解为一个警告窗口 接受一个参数 | | | +| ---------------------------------------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ | +| | [78](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_78) | | +| | [79](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_79) | document.write 主要是可以在浏览器中显示 | +| | [80](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_80) | | +| | [81](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_81) | console.log 这个与document.write 是要区别开的，主要是在控制台console中可以查看 | +| | [82](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_82) | | +| | [83](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_83) | prompt 就是接受一个参数 在浏览器接受用户输入，跟其他语言的输入是一样的效果 | + +## 五. 定义一些你日常生活或者在某些程序中见到的变量(10个)(预习) + +| | | | +| ------------------------------------------ | ------------------------------------------------------------ | -------------------------------------------------------- | +| 我们主要有两个定义变量的方法，一个定义常量 | | | +| | [88](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_88) | | +| | [89](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_89) | var 基本是不使用了 | +| | [90](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_90) | | +| | [91](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_91) | let较多 变量 | +| | [92](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_92) | | +| | [93](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_93) | const 是用来定义常量 之后会经常使用 | +| | [94](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_94) | | +| | [95](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_95) | let arr=[10,20,30] | +| | [96](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_96) | | +| | [97](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_97) | let age=12 | +| | [98](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_98) | | +| | [99](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_99) | const number=11012011911 | +| | [100](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_100) | | +| | [101](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_101) | const name=‘小明’ | +| | [102](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_102) | | +| | [103](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_103) | 新手才用分号，反正我不用，要么全部使用分号，要么都别使用 | +| | [104](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_104) | | + + + +## 六. 说出JavaScript中的常见数据类型以及它们代表的含义(预习) + +| 数字类型 | | | +| -------- | ------------------------------------------------------------ | -------------------------------------------------------- | +| | [114](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_114) | | +| | [115](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_115) | 数字，可以是整数，小数，整数，负数 | +| | [116](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_116) | | +| | [117](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_117) | js是弱数据类型只有我们赋值后，我们才能确认是什么数据类型 | +| | [118](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_118) | | +| | [119](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_119) | Java是强的不一样的哦 | +| | [120](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_120) | | +| | [121](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_121) | 字符串类型 | +| | [122](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_122) | | +| | [123](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_123) | 通过单或者双引号、反引号包裹，个人建议单引号 | +| | [124](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_124) | | +| | [125](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_125) | 引号是可以互相嵌套使用的哦 | +| | [126](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_126) | | +| | [127](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_127) | 布尔类型（Boolean） | +| | [128](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_128) | | +| | [129](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_129) | 表示肯定或否定 | +| | [130](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_130) | | +| | [131](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_131) | TRUE，FALSE | +| | [132](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_132) | | +| | [133](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_133) | let =TRUE | +| | [134](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_134) | | +| | [135](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_135) | 也可以在逻辑判断中直接生效 | +| | [136](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_136) | | +| | [137](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_137) | 还有未定义类型（undefined） | +| | [138](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_138) | | +| | [139](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_139) | 未定义的比较特殊的类型 | +| | [140](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_140) | | +| | [141](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_141) | 只声明变量没有赋值的话默认值是undefined | +| | [142](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_142) | | +| | [143](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_143) | | +| | [144](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_144) | | +| | [145](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_145) | 咱们可以通过typeof来检测该变量是什么数据类型的哦 | +| | [146](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_146) | | +| | [147](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_147) | let obj=null | +| | [148](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_148) | | +| | [149](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_149) | console.log（typefo (obj)） | + -- Gitee From fca35c504bdcd15b7566c93b1de52f983dedccba Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=9D=A8=E6=97=AD=E4=B8=9C?= <1875779940@qq.com> Date: Thu, 26 Oct 2023 19:15:57 +0800 Subject: [PATCH 2/2] =?UTF-8?q?=E6=9D=A8=E6=97=AD=E4=B8=9C=E7=9A=84?= =?UTF-8?q?=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...72\347\241\200\351\203\250\345\210\206.md" | 207 +++++++++--------- 1 file changed, 107 insertions(+), 100 deletions(-) diff --git "a/55 \346\235\250\346\227\255\344\270\234/20231026javascipt \347\232\204\345\237\272\347\241\200\351\203\250\345\210\206.md" "b/55 \346\235\250\346\227\255\344\270\234/20231026javascipt \347\232\204\345\237\272\347\241\200\351\203\250\345\210\206.md" index 5eca7c4..54fca11 100644 --- "a/55 \346\235\250\346\227\255\344\270\234/20231026javascipt \347\232\204\345\237\272\347\241\200\351\203\250\345\210\206.md" +++ "b/55 \346\235\250\346\227\255\344\270\234/20231026javascipt \347\232\204\345\237\272\347\241\200\351\203\250\345\210\206.md" @@ -36,34 +36,35 @@ google.onclick = function(){ ## 二. 简单聊聊JavaScript的历史(自己的话术来总结) -| | | | -| ---------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ | -| JavaScript作者是Brendan Eich | | | -| | [40](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_40) | | -| | [41](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_41) | 刚开始并不是叫这个名字，在Navigator2.0 beta 3版本正式重命名为JavaScript，当时是为了给这门语言搭上Java这个热词；主要就是蹭热度 | -| | [42](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_42) | | -| | [43](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_43) | 在Navigator2.0 beta 3版本正式重命名为JavaScript，当时是为了给这门语言搭上Java这个热词； | -| | [44](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_44) | | -| | [45](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_45) | 借鉴C语言的基本语法； | -| | [46](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_46) | | -| | [47](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_47) | 借鉴Java语言的数据类型和内存管理； | -| | [48](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_48) | | -| | [49](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_49) | 借鉴Scheme语言，将函数提升到"第一等公民"（first class）的地位； | -| | [50](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_50) | | -| | [51](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_51) | 借鉴Self语言，使用基于原型（prototype）的继承机制。 | -| | [52](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_52) | | -| | [53](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_53) | 1996年11月，网景正式向ECMA（欧洲计算机制造商协会）提交语言标准。 | -| | [54](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_54) | | -| | [55](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_55) | 1997年6月，ECMA以JavaScript语言为基础制定了ECMAScript标准规范ECMA-262; | -| | [56](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_56) | | -| | [57](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_57) | ECMA-262是一份标准，定义了ECMAScript; | -| | [58](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_58) | | -| | [59](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_59) | JavaScript成为了ECMAScript最著名的实现之一; | -| | [60](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_60) | | -| | [61](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_61) | 除此之外，ActionScript和JScript也都是ECMAScript规范的实现语言； | -| | [62](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_62) | | -| | [63](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_63) | 所以说，ECMAScript是一种规范，而JavaScript是这种规范的一种实现。 | -| | [64](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_64) | | +```javascript +JavaScript作者是Brendan Eich + +刚开始并不是叫这个名字，在Navigator2.0 beta 3版本正式重命名为JavaScript，当时是为了给这门语言搭上Java这个热词；主要就是蹭热度 + +在Navigator2.0 beta 3版本正式重命名为JavaScript，当时是为了给这门语言搭上Java这个热词； + +借鉴C语言的基本语法； + +借鉴Java语言的数据类型和内存管理； + +借鉴Scheme语言，将函数提升到"第一等公民"（first class）的地位； + + 借鉴Self语言，使用基于原型（prototype）的继承机制。 + +1996年11月，网景正式向ECMA（欧洲计算机制造商协会）提交语言标准。 + + 1997年6月，ECMA以JavaScript语言为基础制定了ECMAScript标准规范ECMA-262; + +ECMA-262是一份标准，定义了ECMAScript; + + JavaScript成为了ECMAScript最著名的实现之一; + + 除此之外，ActionScript和JScript也都是ECMAScript规范的实现语言； + + 所以说，ECMAScript是一种规范，而JavaScript是这种规范的一种实现。 + + +``` @@ -71,12 +72,13 @@ google.onclick = function(){ -| | | | -| ------------------------------------------------------------ | ------------------------------------------------------------ | ------------------------------------------------------------ | -| 首先呢我认为JavaScript是一个非常随便的语言，别的语言不敢做的 我js直接乱杀 | | | -| | [68](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_68) | | -| | [69](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_69) | 排版引擎（layout engine），也称为浏览器引擎（browser engine）、页面渲染引擎（rendering engine）或样版引擎。 | -| | [70](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_70) | | +```js + + + 首先呢我认为JavaScript是一个非常随便的语言，别的语言不敢做的 我js直接乱杀 + +排版引擎（layout engine），也称为浏览器引擎（browser engine）、页面渲染引擎（rendering engine）或样版引擎。 +``` @@ -84,78 +86,83 @@ google.onclick = function(){ 4 alert ,document.write,console.log() prompt -| alert就是弹出一个窗口，可以理解为一个警告窗口 接受一个参数 | | | -| ---------------------------------------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ | -| | [78](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_78) | | -| | [79](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_79) | document.write 主要是可以在浏览器中显示 | -| | [80](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_80) | | -| | [81](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_81) | console.log 这个与document.write 是要区别开的，主要是在控制台console中可以查看 | -| | [82](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_82) | | -| | [83](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_83) | prompt 就是接受一个参数 在浏览器接受用户输入，跟其他语言的输入是一样的效果 | +```js +alert ,document.write,console.log() prompt + +alert就是弹出一个窗口，可以理解为一个警告窗口 接受一个参数 + +document.write 主要是可以在浏览器中显示 + +console.log 这个与document.write 是要区别开的，主要是在控制台console中可以查看 + +prompt 就是接受一个参数 在浏览器接受用户输入，跟其他语言的输入是一样的效果 +``` + + ## 五. 定义一些你日常生活或者在某些程序中见到的变量(10个)(预习) -| | | | -| ------------------------------------------ | ------------------------------------------------------------ | -------------------------------------------------------- | -| 我们主要有两个定义变量的方法，一个定义常量 | | | -| | [88](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_88) | | -| | [89](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_89) | var 基本是不使用了 | -| | [90](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_90) | | -| | [91](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_91) | let较多 变量 | -| | [92](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_92) | | -| | [93](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_93) | const 是用来定义常量 之后会经常使用 | -| | [94](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_94) | | -| | [95](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_95) | let arr=[10,20,30] | -| | [96](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_96) | | -| | [97](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_97) | let age=12 | -| | [98](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_98) | | -| | [99](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_99) | const number=11012011911 | -| | [100](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_100) | | -| | [101](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_101) | const name=‘小明’ | -| | [102](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_102) | | -| | [103](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_103) | 新手才用分号，反正我不用，要么全部使用分号，要么都别使用 | -| | [104](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_104) | | +```js +我们主要有两个定义变量的方法，一个定义常量 + +var 基本是不使用了 + +let较多 变量 + +const 是用来定义常量 之后会经常使用 + +let arr=[10,20,30] + +let age=12 + +const number=11012011911 + +const name=‘小明’ + +新手才用分号，反正我不用，要么全部使用分号，要么都别使用 +``` ## 六. 说出JavaScript中的常见数据类型以及它们代表的含义(预习) -| 数字类型 | | | -| -------- | ------------------------------------------------------------ | -------------------------------------------------------- | -| | [114](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_114) | | -| | [115](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_115) | 数字，可以是整数，小数，整数，负数 | -| | [116](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_116) | | -| | [117](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_117) | js是弱数据类型只有我们赋值后，我们才能确认是什么数据类型 | -| | [118](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_118) | | -| | [119](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_119) | Java是强的不一样的哦 | -| | [120](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_120) | | -| | [121](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_121) | 字符串类型 | -| | [122](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_122) | | -| | [123](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_123) | 通过单或者双引号、反引号包裹，个人建议单引号 | -| | [124](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_124) | | -| | [125](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_125) | 引号是可以互相嵌套使用的哦 | -| | [126](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_126) | | -| | [127](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_127) | 布尔类型（Boolean） | -| | [128](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_128) | | -| | [129](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_129) | 表示肯定或否定 | -| | [130](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_130) | | -| | [131](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_131) | TRUE，FALSE | -| | [132](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_132) | | -| | [133](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_133) | let =TRUE | -| | [134](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_134) | | -| | [135](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_135) | 也可以在逻辑判断中直接生效 | -| | [136](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_136) | | -| | [137](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_137) | 还有未定义类型（undefined） | -| | [138](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_138) | | -| | [139](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_139) | 未定义的比较特殊的类型 | -| | [140](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_140) | | -| | [141](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_141) | 只声明变量没有赋值的话默认值是undefined | -| | [142](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_142) | | -| | [143](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_143) | | -| | [144](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_144) | | -| | [145](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_145) | 咱们可以通过typeof来检测该变量是什么数据类型的哦 | -| | [146](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_146) | | -| | [147](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_147) | let obj=null | -| | [148](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_148) | | -| | [149](https://gitee.com/class-04-grade-2022/fundamentals-of-java-script/pulls/3/files#fc58b31db8319d3d0ceaa957e17aa2fea5d9b3b0_0_149) | console.log（typefo (obj)） | +```js +数字类型 + +数字，可以是整数，小数，整数，负数 + +js是弱数据类型只有我们赋值后，我们才能确认是什么数据类型 + +Java是强的不一样的哦 + +字符串类型 + +通过单或者双引号、反引号包裹，个人建议单引号 + +引号是可以互相嵌套使用的哦 + +布尔类型（Boolean） + +表示肯定或否定 + +TRUE，FALSE + +let =TRUE + +也可以在逻辑判断中直接生效 + +还有未定义类型（undefined） + +未定义的比较特殊的类型 + +只声明变量没有赋值的话默认值是undefined + + + +咱们可以通过typeof来检测该变量是什么数据类型的哦 + +let obj=null + +console.log（typefo (obj)） +``` -- Gitee