JavaScript 实现数字每四位用空格分隔的示例

JavaScript与jQuery代码实现

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>本站</title>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script>
$(document).ready(function () {
 $('#ant').on('keyup mouseout input', function () {
  var $this = $(this);
  var v = $this.val();
  /\S{5}/.test(v) && $this.val(v.replace(/\s/g, '').replace(/(.{4})/g, "$1 "));
 });
})
</script>
</head>
<body>
<input type="text" id="ant" />
</body>
</html>