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How to check non-zero positive integers using JS regular code

php中世界最好的语言
php中世界最好的语言Original
2018-03-30 14:22:534033browse

This time I will show you how to verify non-zero positive integers using JS regular expressions. What are the precautions for regular verification of non-zero positive integers? The following is a practical case, let’s take a look.

Not much to say, please look at the example code

<!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*$/;
      //var regu = /^([1-9][0-9]*){1,3}$/; 亲测可用
      //var regu = /^\+?[1-9][0-9]*$/; 亲测可用
      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>

## I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Detailed explanation of the use of the most basic regular expressions in JS

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