<!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>
数字每4位加空格
</title>
<script type="text/javascript">
window.onload = function() {
var t = document.getElementById("test");
t.onkeydown = change;
t.onkeyup = change;
t.onkeypress = change;
}
function change() {
this.value = this.value.replace(/D/g, '').replace(/....(?!$)/g, '$& '); //替换空格前4位数字为4位数字加空格
}
</script>
</head>
<body>
<input type="text" id="test" />
</body>
</html>