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<!DOCTYPE html>
 <html lang="en">
 <head>
 <meta charset="utf-8" />
 <title>判斷數(shù)字是否為兩位數(shù)</title>
 <style type="text/css">
body {font: 12px/1.5 arial;text-align: center;}
.f-text {width: 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("請(qǐng)輸入數(shù)字！") :
alert(/^\d{2}$/.test(parseInt(aInput[0].value)) ? "√ 是兩位數(shù)" :  "這是" + aInput[0].value.length + "位數(shù)");
}
};
</script>
</head>

 <body>
 <input type="text" class="f-text" /><input type="button"     value="是  否為兩位數(shù)" />    
 </body>
 </html>

Was bedeutet das ?“ in

1.this.value = this.value.replace(/¹/,““)?