<html>
<head>
<script type="text/javascript">
function maskEdit(pattern) {
var src = event.srcElement;
var selRange = document.selection.createRange();
var srcRange = src.createTextRange();
selRange.setEndPoint("StartToStart", srcRange);
var num = selRange.text + String.fromCharCode(event.keyCode) + srcRange.text.substr(selRange.text.length);
event.returnValue = pattern.test(num);
}
</script>
</head>
<body>
<input type="text" onkeypress="maskEdit(/^[\w]*$/)" />
</body>
<head>
<script type="text/javascript">
function maskEdit(pattern) {
var src = event.srcElement;
var selRange = document.selection.createRange();
var srcRange = src.createTextRange();
selRange.setEndPoint("StartToStart", srcRange);
var num = selRange.text + String.fromCharCode(event.keyCode) + srcRange.text.substr(selRange.text.length);
event.returnValue = pattern.test(num);
}
</script>
</head>
<body>
<input type="text" onkeypress="maskEdit(/^[\w]*$/)" />
</body>
</html>
示例:
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