Judge positive or negative numbers

From , 4 Years ago, written in JavaScript, viewed 51 times.

<script type="text/javascript">
  var float_num = -12;
        if (!/^-?(?:\d+|\d{1,3}(?:,\d{3})+)(?:\.\d+)?$/.test(float_num)) {
                //非法
                alert("no");
        }else{
                //通过
                alert("ok");
        }
  </script>

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Judge positive or negative numbers

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