非空验证 

<html>

    <head>
        <meta charset="UTF-8">
        <title></title>
        <script language="javascript">
            function check() {
                if(document.all.txtName.value == "") {
                    alert("不能为空！");
                    document.all.txtName.focus();
                    return false;
                }
                return true
            }
        </script>
    </head>

    <body>
        <input name="txtName" type="text" id="txtName" />
        <input type="submit" name="btnSubmit" value="提交" id="btnSubmit" onclick="return check();" />
    </body>

</html>

 

posted @ 2017-08-15 10:34  军师联盟  阅读(124)  评论(0)  编辑  收藏  举报