利用js正则表达式校验正数、负数、和小数

2020-01-20 22:04:36

字体：大中小

来源：转载

供稿：网友

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 = /^(/-|/+)?/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>