JavaScript正则表达式校验非零的负整数实例

程序员文章站 2024-04-03 10:00:52

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话不多说，请看实例代码：

<!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 = /^-[1-9]\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>