Vue入门之旅：一报错 Unknown ... make sure to provide the "name" option及error compiling template

报错一： Unknown custom element: <custom-select> - did you register the component correctly? For recursive components, make sure to provide the "name" option

代码：

html

<custom-select v-bind:list="list2"></custom-select>

new Vue({
    el: "#app",
    data:{
        list1: [{"name":"beijing"}, {"name" : "hangzhou" }],
        list2: ["2017-1-1", "2017-3-3"]
    }
});
//<li class="match-list-li">'+value.name+'</li>
Vue.component("custom-select", {
    data: function(){
        return {
            selectShow : false,
            val: ""    
        };
    },
    props: ["list"],
    template: `
            <input type="text" class="form-control" placeholder='press "enter" to match the Employee'
             @click="selectShow = !selectShow"    
             :value="val">    
         
              <match-list v-show="selectShow"
                           :list="list"
                          v-on:received="changeValueHandler"
               ></match-list>  
          
            
        `,
    methods : {
        //v-on:received 订阅事件
        changeValueHandler(value){
            this.val = value;

        }
    }
});
//child
Vue.component("match-list", {
    props: ["list"],
    template: `
            <ul class="repo-admin-match">
                <li class="match-list-li" v-for="item of list" @click="changeValueHandler(item)">{{item}}</li>
            </ul>
        `,
    methods : {
        changeValueHandler : function(name){
            //在子组件中有交互
            //告知父级 改变val 需发出一个自定义事件
            this.$emit("received", name);
        }
    }
});

报错原因：

先新建了Vue（new Vue），然后注册组件（Vue.component）。把顺序颠倒一下即可解决

------------------------------------

报错2：error compiling template

这个一般是写的不符合规范，不能被编译

--Component template should contain exactly one root element. If you are using v-if on multiple elements, use v-else-if to chain them instead.大意应该是Component template应该包含一个确切存在的根元素

所以我用<section class="wrap"></wrap>包裹起来