<!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> 驗(yàn)證數(shù)字最簡(jiǎn)單正則表達(dá)式大全 </title> </head> <body> <h3>輸入完按回車后即可驗(yàn)證！（自認(rèn)為最簡(jiǎn)單！）</h3> 正整數(shù): <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^/d+$/.test(this.value));" /> <br /> 負(fù)整數(shù): <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-/d+$/.test(this.value));" /> <br /> 整 數(shù): <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+$/.test(this.value));" /> <br /> 正小數(shù): <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^/d+/./d+$/.test(this.value));" /> <br /> 負(fù)小數(shù): <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-/d+/./d+$/.test(this.value));" /> <br /> 小 數(shù): <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+/./d+$/.test(this.value));" /> <br /> 實(shí) 數(shù): <input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+(/./d+)?$/.test(this.value));" /> <br /> 保留1位小數(shù):<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+(/./d{1,1})?$/.test(this.value));" /> <br /> 保留2位小數(shù):<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+(/./d{1,2})?$/.test(this.value));" /> <br /> 保留3位小數(shù):<input type="text" size="20" onkeydown="if(event.keyCode == 13) alert(/^-?/d+(/./d{1,3})?$/.test(this.value));" /> <br /> </body> </html> 新聞熱點(diǎn)
疑難解答
圖片精選
網(wǎng)友關(guān)注
