Vue.extend()和Vue.component()

// Vue.extend() 传入选项对象 返回构造函数
        let myExtend = Vue.extend({
            data(){
                return{
                    name:'jessica'
                } 
            },
            created(){
                this.say()
            },
            methods: {
                say(){
                    console.log('hello guys. say by'+this.name)
                }
            }
        })
  let myComp = new myExtend()

hello guys. say byjessica

 

// Vue.component('component-name',{options}) 全局注册子组件
        Vue.component('my-component',{
            data(){
                 return {
                     name:'zeng'
                 }
             },
             template:`<span> to {{name}} </span>`,
         })
        let vm = new Vue({
            el:'#vm'
        })

to zeng

 

/ Vue.component('component-name',{options}) 全局注册子组件
//将Vue.component()的第二个参数修改成一个构造器
        let myExennd = Vue.extend({
            data(){
                 return {
                     name:'zeng'
                 }
             },
             template:`<span> to {{name}} </span>`,
         })
        Vue.component('my-component',myExennd)
        let vm = new Vue({
            el:'#vm'
        })

to zeng   结果一样

 

得出结论：Vue.component()接收第二参数的时候，会判断是构造器还是{options}选项，如果是后者，就会隐式调用Vue.extend()返回构造器  谢谢~~~