更优雅的微信小程序骨架屏实现详解

import {
 extendComponent
} from '../../mon/ponent';
extendComponent({
 properties: {
  watchData: null,//观察对应的请求对象
  transition:{//过渡名称，对应该组件的name
   type:String,
   value:null
  }
 },
 observers: {
  "watchData":function(newVal){
   this.data.counter+=1;
   if(this.data.counter>=2){
    this.setData({suess:true});
   }
  }
 },
 data: {
  counter:0,//第一次显示骨架屏，之后就显示真实节点。
  suess:false //不可逆，只能false->true
 }
})

<!--ponents/skeleton/skeleton.wxml-->
<!-- 这里是真实渲染 -->
<view wx:if="{{suess}}" >
  <slot />
</view>

<!-- 这里是骨架屏有动画情况 -->
 <transition 
  wx:elif="{{transition}}"
  show="{{true}}"
  name="{{ transition }}"
  duration="{{800}}"
  custom-class="skeleton custom-class"
 >
  <view style="opacity:0;">
    <slot />
  </view>
</transition>

<!-- 这里是骨架屏:无动画情况 -->
<view wx:else class="skeleton custom-class">
  <view style="opacity:0;">
    <slot />
  </view>
</view>