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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>
- var a =5;
- var b;
- // 先赋值 后自增
- b = a++;
- console.log(a,'a');//6
- console.log(b,'b');//5
- // 先自增 后赋值
- b = ++a;
- console.log(a,'a');//7
- console.log(b,'b');//7
- // 先赋值 后自减
- b = a--;
- console.log(a,'a');//6
- console.log(b,'b');//7
- // 先自减 后赋值
- b = --a;
- console.log(a,'a');//5
- console.log(b,'b');//5
- </script>
- </body>
- </html>
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