输入完按回车后即可验证!(自认为最简单!)
说明：IE6.0、IE7.0、IE8.0、Firefox/3.0.11下测试通过
- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
- <html xmlns="http://www.w3.org/1999/xhtml">
- <head>
- <title> 验证数字最简单正则表达式大全 </title>
- </head>
- <body>
- <h3>输入完按回车后即可验证！（自认为最简单！）</h3>
- 正整数: <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^/d+$/.test(this.value));" />
- <br>
- 负整数: <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-/d+$/.test(this.value));" />
- <br>
- 整 数: <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+$/.test(this.value));" />
- <br>
- 正小数: <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^/d+/./d+$/.test(this.value));" />
- <br>
- 负小数: <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-/d+/./d+$/.test(this.value));" />
- <br>
- 小 数: <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+/./d+$/.test(this.value));" />
- <br>
- 实 数: <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+/.?/d*$/.test(this.value));" />
- <br>
- 保留1位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+/.?/d{0,1}$/.test(this.value));" />
- <br>
- 保留2位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+/.?/d{0,2}$/.test(this.value));" />
- <br>
- 保留3位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+/.?/d{0,3}$/.test(this.value));" />
- <br>
- </body>
- </html>
新闻热点
疑难解答
