父子孙组件的传值说明和 Vue.component 与 new Vue({components:{} })的区别说明

var myheader_child = {
  template: "{{ geta }}{{getb}}{{getcount}}",
  props:["geta","getb","getcount"]
}
var myheader = {
  
  template: "
"
  ,components: {
    "myheaderChild": myheader_child, //先在components中注册，才能在template模板中使用。
  },
  props: ['mycount'],//显式声明
  data: function () {
    return {a: "aaaa", b: "bbbbbbb"};
  }
}
var vm = new Vue({
  el: "#app",
  data: {
    count: 2
  },
  components: {
    "myheader": myheader
  },
  methods: {
    plusone: function () {
      this.count++;
    }
  }
})

//全局注册组件：
Vue.component("componentName",
  {
    template: "
",
    props: ["propName"]
    ,data: function () {
    return {"xxx": "yyyy"};
  }
  })