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  • 2.13.JavaScript条件语句

    <!DOCTYPE HTML>
    <html lang="en-US">
    <head>
    <meta charset="UTF-8">
    <title>2.13.JavaScript.条件语句</title>
    </head>
    <body>
    <script type="text/javascript">

    /*
    //if else语句
    if( 100 > 10 ){
    document.write("真");
    }else{
    document.write("假");
    }
    */
    //

    function checkChange(){
    var username = document.getElementById("username");//获取到html节点
    if( username.value == ""){
    alert(
    "用户名不能为空");
    }
    else if( username.value == "admin" || username.value == "xiaozhanga4"){
    alert(
    "恭喜你," + username.value);
    }
    else{
    alert(
    "用户名错误");
    }

    }

    </script>

    <form method="post" action="">
    <input type="text" name="username" id="username"/>
    <input type="submit" value="提交" onclick="checkChange();"/>
    </form>


    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/xiaozhanga4/p/2398413.html
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