- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <HTML>
- <head>
- <title>
- Title
- </title>
- <meta charset="UTF-8">
- </head>
- <body>
- <script>
- // (1).var a=1;
- // var b=a++; // 先赋值, 再运算
- // alert(b); 1
- // alert(a); 2
- // (2).var a=1
- // var b= ++a;// 先运算, 再赋值
- // alert(b); 2
- // alert(a); 2
- var x = 1;
- alert(x++); //1
- alert(++x); //3
- alert(x--); //3
- alert(--x); //1
- alert(x); //1
- </script>
- </body>
- </HTML>
来源: http://www.bubuko.com/infodetail-3393613.html