//声明
Vue.component("blog-post", {
 props: {
  postTitle: {
   type: Number,
   default: 10000
  }
 },
 template: "<h3>{{ postTitle }}</h3>"
});
//在template中，显示调用prop 属性，default不生效
<blog-post :postTitle="54"></blog-post>
//在template中，不调用prop 属性，default生效
<blog-post></blog-post>

refAge: {
type: Number,
default: 0
},
refName: {
type: String,
default: ''
},
hotDataLoading: {
type: Boolean,
default: false
},
hotData: {
type: Array,
default: () => {
return []
}
},
getParams: {
type: Function,
default: () => () => {}
},
meta: {
type: Object,
default: () => ({})
}