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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>运算</title>
- </head>
- <body>
- <script>
- var a = 5;
- var b;
- // a++ 先赋值 后自增
- b = a++;
- console.log(b,'b')
- console.log(a,'a')
- var d = 5;
- var c;
- // ++a 先自增 后赋值
- c = ++d;
- console.log(c,'c')
- console.log(d,'d')
- // a= 6 b=5
- a = b--;
- // b-- 先赋值 后自减
- console.log(b,'b')
- console.log(a,'a')
- // a=5 b=4
- b = --a
- // --b 先自减 后赋值
- console.log(b,'b')
- console.log(a,'a')
- </script>
- </body>
- </html>
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