利用js正则表达式校验正数、负数、和小数

本文主要介绍了怎样利用js正则表达式校验正数、负数、和小数的具体实现代码，具有一定的参考价值。需要的朋友可以看下

话不多少，直接附上代码实例，仅供参考

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									<!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>

									  <title></title>

									  <script type="text/javascript">

									    function validation() {

									      var val = document.getelementbyid("txtnumber").value;

									      var regu = /^(\-|\+)?\d+(\.\d+)?$/;

									      if (val != "") {

									        if (!regu.test(val)) {

									          document.getelementbyid("labresult").style.color = "red";

									          document.getelementbyid("labresult").innerhtml = "验证失败！";

									        } else {

									          document.getelementbyid("labresult").style.color = "green";

									          document.getelementbyid("labresult").innerhtml = "验证成功！";

									        }

									      }

									    }

									  </script>

									</head>

									<body>

									  <input id="txtnumber" name="txtnumber" type="text" />

									  <input id="btnvalidation" name="btnvalidation" type="button" value="校验" onclick="validation()" />

									  验证结果：<label id="labresult" ></label>

									</body>

									</html>