<ul id="ul1" >
<li>111</li>
<li>222</li>
<li>333</li>
<li>444</li>
</ul>
如果給每個(gè)li添加點(diǎn)擊事件：
var li=document.getElementsByTagName('li');
function A(){
    alert(li.innerHTML);
};
li.click=A;

<!-- 利用事件委派和編程式導(dǎo)航實(shí)現(xiàn)路由跳轉(zhuǎn)和傳參-->
<div class="all-sort-list2" @click="goSearch">

methods:{
   goSearch(){
     this.$router.push('/search');
   }
}

<div class="all-sort-list2" @click="goSearch">
   <div
     class="item"
     v-for="(c1, index) in categoryList"
     :key="c1.categoryId"
     @mouseenter="changeIndex(index)"
     :class="{ cur: currentIndex === index }"
   >
     <h3>
       <!-- 給a標(biāo)簽添加自定義屬性 -->
       <a
         :data-categoryName="c1.categoryName"
         :data-category1Id="c1.categoryId"
         >{{ c1.categoryName }}</a>
     </h3>
     <!-- 二三級(jí)分類 -->
     <div
       class="item-list clearfix"
       :style="{
         display: currentIndex === index ? 'block' : 'none',
       }"
     >
       <div
         class="subitem"
         v-for="c2 in c1.categoryChild"
         :key="c2.categoryId"
       >
         <dl class="fore">
           <dt>
             <a
               :data-categoryName="c2.categoryName"
               :data-category2Id="c2.categoryId"
               >{{ c2.categoryName }}</a
             >
           </dt>
           <dd>
             <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
               <a
                 :data-categoryName="c3.categoryName"
                 :data-category3Id="c3.categoryId"
                 >{{ c3.categoryName }}</a
               >
             </em>
           </dd>
         </dl>
       </div>
     </div>
   </div>
 </div>

goSearch(event) {
      //event.target:獲取到的是觸發(fā)事件的元素(div、h3、a、em、dt、dl)
      let node = event.target;
      //給a標(biāo)簽添加自定義屬性data-categoryName,全部的字標(biāo)簽當(dāng)中只有a標(biāo)簽帶有自定義屬性，別的標(biāo)簽名字----dataset純屬扯淡
      let { categoryname, category1id, category2id, category3id } =
        node.dataset;
      //第二個(gè)問題解決了：點(diǎn)擊的到底是不是a標(biāo)簽（只要這個(gè)標(biāo)簽身上帶有categoryname）一定是a標(biāo)簽
      //當(dāng)前這個(gè)if語(yǔ)句：一定是a標(biāo)簽才會(huì)進(jìn)入
      if (categoryname) {
        //準(zhǔn)備路由跳轉(zhuǎn)的參數(shù)對(duì)象
        let loction = { name: "search" };  // 固定參數(shù)
        let query = { categoryName: categoryname };
        //一定是a標(biāo)簽：一級(jí)目錄
        if (category1id) {
          query.category1Id = category1id;
          //一定是a標(biāo)簽：二級(jí)目錄
        } else if (category2id) {
          query.category2Id = category2id;
          //一定是a標(biāo)簽：三級(jí)目錄
        } else {
          query.category3Id = category3id;
        }
        //判斷：如果路由跳轉(zhuǎn)的時(shí)候，帶有params參數(shù)，捎帶腳傳遞過去
        if (this.$route.params) {
          // 添加動(dòng)態(tài)參數(shù)
          loction.params = this.$route.params;
          //動(dòng)態(tài)給location配置對(duì)象添加query屬性
          loction.query = query; 
          //路由跳轉(zhuǎn)
          this.$router.push(loction);
        }
      }
    },