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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>入门</title>
- </head>
- <body>
- <script>
-
-
-
-
-
- console.log("浏览器控制台输出")
- console.log("浏览器控制台输出")
-
- var a = 12;
- console.log( typeof a);
- console.log("变量:"+a);
- {
- var b = 22;
- }
- console.log("变量:"+b);
-
-
-
-
- const d = 10;
- console.log("变量:"+d);
-
-
- let n = 20;
- let s = "hello js";
- let m = null;
- let t = true;
- let f ;
- console.log(typeof n)
- console.log(typeof s)
- console.log(typeof m)
- console.log(typeof t)
- console.log(typeof f)
-
- var s1 = "20";
- var s2 = "30abc";
- var a = +"10"+10;
- console.log(s1+a);
- console.log(s2+a);
- console.log(a);
-
- let number = parseInt("a123abc");
- console.log(number)
-
- let b2 = true+1;
- console.log(b2)
-
- if (3){
- console.log(3)
- }
-
- if (""){
- console.log("空窜")
- }
- </script>
- </body>
- </html>
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