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判断数字是否为两位数
<!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> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>判断数字是否为两位数</title> <style> body{font:12px/1.5 arial;text-align:center;} .f-text{50px;border:1px solid #ccc;background:#f0f0f0;font-family:inherit;padding:3px;margin-right:10px;} </style> <script type="text/javascript"> window.onload = function () { var aInput = document.getElementsByTagName("input"); var aSpan = document.getElementsByTagName("span")[0]; var i = 0; aInput[0].onkeyup = function () { this.value = this.value.replace(/[^d]/,"") } aInput[1].onclick = function () { (aInput[0].value == "") ? alert("请输入数字！") : alert(/^d{2}$/.test(parseInt(aInput[0].value)) ? "√ 是两位数" : "这是" + aInput[0].value.length + "位数"); } }; </script> </head> <body> <input type="text" class="f-text" /><input type="button" value="是否为两位数" /> </body> </html>