function clickWriter(obj) {
    $(obj).parent().find("a").each(function() {
        $(this).removeClass("active");
    $(obj).addClass("active");
//each()循环遍历
html代码
 
            <li class="nav-item nav-dropdown">
                <a href="#" class="nav-link nav-dropdown-toggle" data-toggle="tab" >
                    <i class="icon icon-cloud-upload"></i>上传资源 <i class="fa fa-caret-left"></i>
                <ul class="nav-dropdown-items">
                    <li class="nav-item" onclick="clickWriter(this)">
                        <a  class="nav-link" data-toggle="tab" href="#assignment" onclick="getassignment(event)">
                            <i class="icon icon-cloud-upload"></i>物联网课程
                    <li class="nav-item" onclick="clickWriter(this)">
                        <a  class="nav-link" data-toggle="tab" href="#assignment" onclick="getassignment(event)">
                            <i class="icon icon-cloud-upload"></i>Linux课程
                    <li class="nav-item" onclick="clickWriter(this)">
                        <a class="nav-link" data-toggle="tab" href="#assignment" onclick="getassignment(event)">
                            <i class="icon icon-cloud-upload"></i>GIS课程
                    <li class="nav-item" onclick="clickWriter(this)">
                        <a class="nav-link" data-toggle="tab" href="#assignment" onclick="getassignment(event)">
                            <i class="icon icon-cloud-upload"></i>软件工程课程
                    <li class="nav-item" onclick="clickWriter(this)">
                        <a class="nav-link" data-toggle="tab" href="#assignment" onclick="getassignment(event)">
                            <i class="icon icon-cloud-upload"></i>马克思课程
                    <li class="nav-item" onclick="clickWriter(this)">
                        <a class="nav-link" data-toggle="tab" href="#assignment" onclick="getassignment(event)">
                            <i class="icon icon-cloud-upload"></i>专业英语课程
                    效果图：实现上部分效果其实很简单下面是代码js代码function clickWriter(obj) {    $(obj).parent().find("a").each(function() {        $(this).removeClass("active");    });    $(obj).addClass("active");}//each()循环遍历h...
$("li").click(function() {
  $("li").removeClass("active"); //移除所有li的active类
  $(this).addClass("active"); //给当前点击的li添加active类
CSS部分：
.active {
  background-color: #ccc; //选中的li的背景颜色
这段代码会在每次点击li时，移除所有li的active类，然后给当前点击的li添加active类，从而改变选中的li的背景颜色。
				vue2.x+ts项目,在props type导入自定义接口类型报‘xxx‘ only refers to a type, but is being used as a value here处理办法
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