阻止Bootstrap的dropdown-menu的弹框事件，取消Bootstrap的dropdown-menu点击默认关闭事件

<div id="com-choose" tabindex="4"  class="dropdown">
                        <a href="#" title="连接" id='command-connecting-a' type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            <img src="./static/img/icon/connect.png" alt="">
                            <span>连接</span>
                        </a>
                        <ul class="dropdown-menu nav-li-hovershow" aria-labelledby="command-connecting-a"></ul>
                    </div>

 function searchDevice(e) {
        $('#com-choose>.nav-li-hovershow').html('');
        var deviceList = ipc.sendSync('searchDevice');
        switch (deviceList.length) {
            case 0:
                // $("#com-choose>.nav-li-hovershow").html("<li>没有查找到设备</li>");
                console.log('123');
                $("#command-connecting-a span").html('连接')
                alert('没有查找到设备!');
                e.stopPropagation(); //阻止事件
                break;
            default:
                let exp = /.*((.*))/;
                let device = ''
                deviceList.forEach(element => {
                    device += '<li><a href="#">' + element.deviceName.match(exp)[1] + '</a></li>';
                    // console.log(element);
                    
                });
                $("#com-choose>.nav-li-hovershow").html(device);
                // $('.device-show-list').toggle();
                break;
        }
        
    }

<div class="dropdown">
    <a href="#" data-toggle="dropdown">
         <i class="fa fa-cog fa-2x"> </i>
    </a>
    <div class="dropdown-menu jq22-container">
         <div id="treeview" class=""></div>
    </div>
</div>

在dropdown-menu中的需要处理的元素添加 data-stopPropagation=”true”，data-stopPropagation属性是用来对点击时停止传播事件，这样我们的点击事件就不会传播给Bootstrap.js中去了。

调用Bootstrap的stopPropagation()函数，可以阻止元素点击时停止传播事件。
对整个treeview声明一个click事件，并且全部绑定上stopPropagation()方法。

$(".treeview").on("click",function (e) {
    e.stopPropagation();
})