写了个最简单的正则表达式遇到有关问题请帮忙-JavaSript-爱易网页

写了个最简单的正则表达式遇到有关问题请帮忙

日期：2014-05-16　浏览次数：20919 次

写了个最简单的正则表达式遇到问题请各位高手帮忙
代码如下：
<script language= "javascript " type= "text/javascript ">
function check(){

var pattern = new RegExp( "/\d{2}/ ");
var obj = document.getElementById( 'textfield ');

if( pattern.test( obj.value ) ){
alert( 'true ');
obj.focus();
}else{
alert( 'false ');
obj.focus();
}
}
</script>
</head>

<body>
<form id= "form1 " name= "form1 " method= "post " action= " ">
<input type= "text " name= "textfield " id= "textfield " />
<input type= "button " name= "Submit " value= "提交 " onclick= "javascript: check(); " />
</form>
</body>
</html>

在文本框输入12，弹出框显示的是“false“这是为什么啊?

------解决方案--------------------
var pattern = new RegExp( "/\d{2}/ ");
改成
var pattern = new RegExp(/\d{2}/);
不要加引号
------解决方案--------------------
var pattern = new RegExp( "/\d{2}/ ");--> var pattern = new RegExp(/\d{2}/);
------解决方案--------------------
<script language= "javascript " type= "text/javascript ">
function check(){

var pattern = new RegExp( "\\d{2} ");
alert(pattern)
var obj = document.getElementById( 'textfield ');

if( pattern.test( obj.value ) ){
alert( 'true ');
obj.focus();
}else{
alert( 'false ');
obj.focus();
}
}
</script>