利用js正则表达式校验正数、负数、和小数

网络编程 2024/11/20 佚名

3 1 2

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.w3.org/1999/xhtml">
<head>
  <title></title>
  <script type="text/javascript">
    function validation() {
      var val = document.getElementById("txtNumber").value;
      var regu = /^(\-|\+)"") {
        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>