一個(gè)二級(jí)菜單類似與小米首頁(yè)的菜單0.0就不寫注釋

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>二級(jí)菜單</title>
    <style>
        *{
            margin:0;
            padding: 0;
            box-sizing:border-box;

        }
        body{
            background: #34495E;
        }
        #box{
            position: relative;
            background: #3C3C3C;
            width: 200px;
            height: 370px;
        }
        ul{
            list-style: none;
            width: 200px;
            text-align: center;
            font-size: 26px;
            color: #fff;
            padding-top: 0.1px;
        }
        li{
            background: rgba(77,77,77,0.5);
            margin:5px auto; 
            width: 200px;
            height: 40px;
            line-height: 40px;

        }
        li:hover{
            background: #FFCE3E;
            color: #000;
        }
        #concent{
            position: absolute;
            top:0;
            left: 200px;
            display: "none";
            /*background: #FFF;*/
            background: rgba(77,77,77,0.9);
            border-radius: 0 20px 20px 0;
            color: #fff;
            width: 700px;
            height: 370px;
            
        }
        #concent div{
            display: none;
            text-align: center;
            font-size: 40px;
        }
    </style>
</head>
<body>
    <div id = "box">
        <ul>
            <li>加電</li>
            <li>手機(jī)</li>
            <li>彩電</li>
            <li>購(gòu)物</li>
            <li>加電</li>
            <li>手機(jī)</li>
            <li>彩電</li>
            <li>購(gòu)物</li>
        </ul>
        <div id = "concent" style="display:none">
            <div class="div">加電頁(yè)面</div>
            <div class="div">手機(jī)頁(yè)面</div>
            <div class="div">彩電頁(yè)面</div>
            <div class="div">購(gòu)物頁(yè)面</div>
            <div class="div">加電頁(yè)面</div>
            <div class="div">手機(jī)頁(yè)面</div>
            <div class="div">彩電頁(yè)面</div>
            <div class="div">購(gòu)物頁(yè)面</div>
        </div>
    </div>
</body>
    <script>
        var lis = document.querySelectorAll("li");

        var divs = document.querySelectorAll(".div");
        
        var box = document.querySelector("#box");

        var concent = document.querySelector("#concent");

        box.onmouseover = function (){

            for (var i = 0; i < lis.length; i++) {
                
                lis[i].mm = i;
                    
                lis[i].onmouseover = function(){

                    for (var j = 0; j < divs.length; j++) {

                        divs[j].style.display = "none";
                    }

                    divs[this.mm].style.display = "block";
                }

                concent.style.display = "block";
            }
        }
        box.onmouseout = function(){
            concent.style.display = "none";
        }
    </script>
</html>
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