JS 正则判断输入的URL地址是否正确

2017-02-15 23:59:38

Javascript使用正则表达式检测用户输入的URL地址是否有效:

  • HTML code运行代码复制代码编辑

  • <html><head><title>检查是否为URL</title><script language="javascript">
        function check(){
            str = form1.txt.value;        //str = str.match(/http:\/\/.+/); 
            str = str.match(/^http:\/\/.+\..+/i);        if (str == null){
                alert('你输入的URL无效');            return false;
            }else{
                alert("你输入的URL有效");            return true;
            }
        }</SCRIPT></head><body><form name="form1" onSubmit="return check()">
        <input type="text" name="txt">
        <input type="submit" value="检验"></form></body></html>


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