Click to display the secondary ul codes

<!DOCTYPE html>
<html>
<head>
    <title>Dropdown</title>
    <!--<link rel="stylesheet" href="style.css">-->
    <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
    <script src="js/jquery.min.js"></script>
    <meta charset="utf-8" />
    <style type="text/css">
        body {
            font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
        }
        ul {
            list-style-type: none;
            margin: 0;
            padding: 0;
            overflow: hidden;
            background-color: #333;
        }
        li {
            float: left;
        }
        li a, .dropbtn {
            display: inline-block;
            color: white;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
        }
        li a:hover, .dropdown:hover .dropbtn {
            background-color: #1f75cf;
        }
        li.dropdown {
            display: inline-block;
        }
        .dropdown-content {
            display: none;
            position: absolute;
            background-color: #fafafa;
            min-width: 160px;
            box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
        }
        .dropdown-content a {
            color: black;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
            text-align: left;
        }
        .dropdown-content a:hover {
            color: white;
            background-color: #1f75cf;
        }
        .show {
            display: block;
        }
    </style>
</head>
<body>
<ul>
    <li class="dropdown">
        <a id="a" href="javascript:void(0)" class="dropbtn" onclick="showList(this)">标题 A</a>
        <div class="dropdown-content" id="dropdown-a">
            <a href="#">下拉 1</a>
            <a href="#">下拉 2</a>
            <a href="#">下拉 3</a>
        </div>
    </li>
    <li class="dropdown">
        <a id="b" href="javascript:void(0)" class="dropbtn" onclick="showList(this)">标题 B</a>
        <div class="dropdown-content" id="dropdown-b">
            <a href="#">下拉 1</a>
            <a href="#">下拉 2</a>
            <a href="#">下拉 3</a>
        </div>
    </li>
</ Ul > 
< Script type = "text / JavaScript" > 
    function ShowList (O) {
         //. 1. The other two are hidden ul, 
//         hideList ( "Content-DropDown" + o.id); 
        // 2. the other two hidden manner ul 2 
        hideList ( " dropdown- "  + o.id);
         . // 2 then switch their show. 
//         hideList ( ''); 
        document.getElementById ( " dropdown- "  + o.id) .classList.toggle ( " Show " );
 //        var drop = document.getElementById("dropdown-" + o.id);
//        if (drop.classList.contains('show')) {
//            drop.classList.remove('show');
//        }else{
//            drop.classList.add('show');
//        }
    }


    function hideList(option) {
        var dropdowns = document.getElementsByClassName("dropdown-content");

        for (var i = 0; i < dropdowns.length; i++) {
            var openDropdown = dropdowns[i];
            if (openDropdown.id != option) {
                if (openDropdown.classList.contains('show')) {
                    openDropdown.classList.remove('show');
                }
            }
        }
    }
//    function hideList() {
//        var dropdowns = document.getElementsByClassName("dropdown-content");
//
//        for (var i = 0; i < dropdowns.length; i++) {
//            var openDropdown = dropdowns[i];
//
//                if (openDropdown.classList.contains('show')) {
//                    openDropdown.classList.remove('show');
//                }
////            openDropdown.classList.toggle("show");
//
//        }
//    }


    window.onclick = function(e) {
        if (!e.target.matches('.dropbtn')) {
            hideList("");
        }
    }
</script>
</body>

</html>
Click to display the secondary ul codes

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