From ce511e34519b7e684430e16ffc313248552d2242 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=8E=8B=E5=8F=91=E6=A7=90?= <11785178+wmm1004lsp@user.noreply.gitee.com> Date: Sun, 29 Oct 2023 14:18:48 +0000 Subject: [PATCH] =?UTF-8?q?52=20=E7=8E=8B=E5=8F=91=E6=A7=90?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 王发槐 <11785178+wmm1004lsp@user.noreply.gitee.com> --- .../2023-10-27.md" | 50 +++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 "52 \347\216\213\345\217\221\346\247\220/2023-10-27.md" diff --git "a/52 \347\216\213\345\217\221\346\247\220/2023-10-27.md" "b/52 \347\216\213\345\217\221\346\247\220/2023-10-27.md" new file mode 100644 index 0000000..2807639 --- /dev/null +++ "b/52 \347\216\213\345\217\221\346\247\220/2023-10-27.md" @@ -0,0 +1,50 @@ +~~~html +```javascript +定义变量: let 变量名=值; +定义常量: const; +数据类型: Number (数值) String(字符串类型) boolean(布尔型) Null(空值) +undefined(没有对变量进行初始化时) function(函数) symbol(符号) object(对象) + +打印数据: consale.log(); 返回值或变量的类型: typeof x; +Infinity:无穷大,可为负数 NaN:代表计算错误,想打印的数据不是数字 +isNaN:用于判断是否是数字,是数字返回FALSE,不是数字返回TRUE +``` + + + + + + + Document + + + +

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+ + + + + + + + + + + + + + + + + +
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+ + +``` +~~~ + -- Gitee