Create a breadcrumb navigation bar through elementUI in vue2.0

This article mainly explains the process of making a breadcrumb navigation bar with vue2.0 elementUI in detail. Friends who are interested in this can learn it.

Main.js

var routeList = [];
router.beforeEach((to, from, next) => {
 var index = -1;
 for(var i = 0; i < routeList.length; i++) {
  if(routeList[i].name == to.name) {
   index = i;
   break;
  }
 }
 if (index !== -1) {
//如果存在路由列表，则把之后的路由都删掉
  routeList.splice(index + 1, routeList.length - index - 1);
 } else if(to.name != &#39;登录&#39;){
  routeList.push({"name":to.name,"path":to.fullPath});
 }
 to.meta.routeList = routeList;
 next()
});

2. Use watch or beforeRouteEnter in the component to be used

<template>
  <p class="level-bread">
   <el-breadcrumb separator="/">
    <el-breadcrumb-item v-for="item in realList" :to="item.path">{{item.name}}</el-breadcrumb-item>
   </el-breadcrumb>
  </p>
</template>

<script>
  export default {
   name: "lelve-bread",
   created(){
    this.getRoutePath();
   },
   data() {
    return {
     realList: []
    }
   },
   methods:{
    getRoutePath() {
     this.realList = this.$route.meta.routeList;
    }
   },
   beforeRouteEnter(to,from, next) {
    next((vm) => {
     vm.realList = to.meta.routeList;
    });
   },
   // watch:{
   //  $route:function(newV,oldV) {
   //   this.realList =newV.meta.routeList;
   //  }
   // }
  }
</script>

.

It should be noted that beforeRouteEnter cannot access this at this time.

const Foo = {
 template: `...`,
 beforeRouteEnter (to, from, next) {
  // 在渲染该组件的对应路由被 confirm 前调用
  // 不！能！获取组件实例 `this`
  // 因为当守卫执行前，组件实例还没被创建
 },
 beforeRouteUpdate (to, from, next) {
  // 在当前路由改变，但是该组件被复用时调用
  // 举例来说，对于一个带有动态参数的路径 /foo/:id，在 /foo/1 和 /foo/2 之间跳转的时候，
  // 由于会渲染同样的 Foo 组件，因此组件实例会被复用。而这个钩子就会在这个情况下被调用。
  // 可以访问组件实例 `this`
 },
 beforeRouteLeave (to, from, next) {
  // 导航离开该组件的对应路由时调用
  // 可以访问组件实例 `this`
 }
}

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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