利用js正则表达式校验正数、负数、和小数

作者: 亖呉?盀
来源: 51数据库
2021-08-26

话不多少，直接附上代码实例，仅供参考

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.51sjk.com/Upload/Articles/1/0/269/269817_20210708031441281.jpg">
<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>