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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- </head>
- <body>
- <script>
- // if(true){
- // var a = 10;
- // }
- // console.log(a);
- // let 存在块作用域
- // 块作用域：在{}内的代码就是块作用域
- if(true){
- let a = 10;
- }
- console.log(a);
- </script>
- </body>
- </html>
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