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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> 正则 </title>
<script type="text/javascript">
function doOnBlur(event, elem){
var k = event.keyCode;
if(k == 37 || k == 38 || k ==39 || k ==40 || k == 8 || k == 46){
return false;
}
elem.value = elem.value.replace(/[^\d\.]/g, '');
}
</script>
</head>
<body>
<input id="wz1" type="text" onkeyup="doOnBlur(event, this);" />
</body>
</html>