js限制小数点后3位

<head>
  <script type="text/javascript">
    function checkthis()
    {
      var t=document.forms[0].elements[0];
      var reg=/^\d+[.]?\d{1,3}$/;
      alert(reg.test(t.value));
    }
  </script>
</head>
<body>
  <form>
    <input type="text" id="txt" />
    <input type="button" value="检查" onclick="checkthis();" />
  </form>
</body>

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转载自www.cnblogs.com/QW-lzm/p/12408059.html
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