From 6c8aa59f68f2872b99aaa409b9e8f1a74e0c8c56 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=86=E5=BB=BA=E9=94=8B?= <467466356@qq.com>
Date: Thu, 27 Oct 2022 11:51:22 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E4=B8=83=E6=AC=A1=E4=BD=9C=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
---
...\345\214\205\350\243\205\347\261\273.HTML" | 72 +++++++++++++
...60\345\214\205\350\243\205\347\261\273.md" | 101 ++++++++++++++++++
2 files changed, 173 insertions(+)
create mode 100644 "39\351\231\206\345\273\272\351\224\213/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273.HTML"
create mode 100644 "39\351\231\206\345\273\272\351\224\213/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273/2022-10-26\347\254\254\344\270\203\346\254\241\347\254\224\350\256\260\345\214\205\350\243\205\347\261\273.md"
diff --git "a/39\351\231\206\345\273\272\351\224\213/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273.HTML" "b/39\351\231\206\345\273\272\351\224\213/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273.HTML"
new file mode 100644
index 0000000..de39d37
--- /dev/null
+++ "b/39\351\231\206\345\273\272\351\224\213/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273.HTML"
@@ -0,0 +1,72 @@
+
+
+
+
+
+
+ Document
+
+
+
+
+
+
\ No newline at end of file
diff --git "a/39\351\231\206\345\273\272\351\224\213/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273/2022-10-26\347\254\254\344\270\203\346\254\241\347\254\224\350\256\260\345\214\205\350\243\205\347\261\273.md" "b/39\351\231\206\345\273\272\351\224\213/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273/2022-10-26\347\254\254\344\270\203\346\254\241\347\254\224\350\256\260\345\214\205\350\243\205\347\261\273.md"
new file mode 100644
index 0000000..b1aa06b
--- /dev/null
+++ "b/39\351\231\206\345\273\272\351\224\213/2022-10-26\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232\345\214\205\350\243\205\347\261\273/2022-10-26\347\254\254\344\270\203\346\254\241\347\254\224\350\256\260\345\214\205\350\243\205\347\261\273.md"
@@ -0,0 +1,101 @@
+
+
+ //keys,values,entries,obj
+
+ var obj = {
+ name: '李华',
+ age: 17,
+ gender: '男'
+
+ }
+ //for ... of :遍历
+ for (e of Object.keys(obj)) {
+ console.log(e);
+ }
+ //将键值对成对变成数组放入外层数组(二维数组)
+ const arr = Object.entries(obj)
+ console.log(arr);
+ for(e of Object.entries(obj)){
+ console.log(e);
+ }
+
+ //obj本身是不可迭代的对象
+ for(e of obj){
+ console.log(e);
+ }
+
+ assign:拷贝，浅拷贝(复制的是对象的地址),(手写一个对象的深拷贝)深拷贝(复制的的对象本身)
+ var obj = {
+ name: '李华',
+ age: 16,
+ gender: '男'
+ }
+ var obj1 = {
+ name: '李四',
+ title: 'student'
+ }
+ var obj2 = {
+ name:'王五'
+ }
+ var obj3 = {
+ name:'张三'
+ }
+ var obj2 = Object.assign(obj);
+
+ age gender name title
+ assign：1.浅拷贝一个对象 2.合并对象(target,sources....)
+ console.log(Object.assign(obj,obj1,obj2,4,false,null,[12,3,34],{name:'张三'}));
+ console.log(obj[0]);
+
+
+ 包装类
+ 原始数据类型： number, boolean, string, null, undefined (symbol,bigint)
+ var num = new Number(5) //对象
+ num.a = 6
+ num = num * 2 //会自动变成原始数据类型number
+
+ var bol = new Boolean();
+ bol.a = false
+
+ var str = new String('abc');
+ str.a = 'hi'
+
+ 包装类只有：number，boolean，string,
+ null,undefined是没有包装类的
+
+ var num = 5; //原始数据类型
+ num.a = 7; //1. new Number(5).a = 7 2. delete new Number(5)
+ console.log(num.a); //new Number(5).a undefined
+
+ const arr = [1,3,4,5] //切片 slice
+ arr.length = 2
+ console.log(arr);
+
+ var str = '1345' //原始数据类型
+ str.length = 2 //1.new String('1345').length = 2 2.delete String('1345')
+ str.aaa = 'a' //new Sting('1345').aaa = a 2.delete String('1345')
+ console.log(str);
+ console.log(str.length);//new String('1345').length = 4
+ console.log(String.prototype); //String类有很多方法和length
+ console.log(str.aaa); //new String('1345')
+
+
+ console.log('------');
+ var num = 50
+ num.length = 1
+ console.log(num.length);
+ console.log(Number.prototype);
+
+ //null undefined 没有包装
+
+
+
+
+ 总结 合并对象
+ var target = {name:'李华'}
+ var obj = {name:'王五'}
+ console.log(Object.assign(2,obj)); //number
+ console.log(Object.assign(false,target)); //boolean
+ //包装类：自动转成对象
+ console.log(Object.assign(undefined,obj)); //null undefined
+
--
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