<!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+)?$/.test(this.value));" /> <br /> 保留1位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+(/./d{1,1})?$/.test(this.value));" /> <br /> 保留2位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+(/./d{1,2})?$/.test(this.value));" /> <br /> 保留3位小数:<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+(/./d{1,3})?$/.test(this.value));" /> <br /> </body> </html> 新闻热点
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