说说Vue.js中的functional函数化组件的使用

<div id="app">
  <smart-component :data="data"></smart-component>
  <button @click="change('img')">图片组件</button>
  <button @click="change('video')">视频组件</button>
  <button @click="change('text')">文本组件</button>
</div>

//图片组件设置
var imgOptions = {
  props: ['data'],
  render: function (createElement) {
    return createElement('div', [
      createElement('p', '图片组件'),
      createElement('img', {
        attrs: {
          src: this.data.url,
          height: 300,
          weight: 400

        }
      })
    ]);
  }
};

//视频组件设置
var videoOptions = {
  props: ['data'],
  render: function (createElement) {
    return createElement('div', [
      createElement('p', '视频组件'),
      createElement('video', {
        attrs: {
          src: this.data.url,
          controls: 'controls',
          autoplay: 'autoplay'
        }
      })
    ]);
  }
};

//文本组件设置
var textOptions = {
  props: ['data'],
  render: function (createElement) {
    return createElement('div', [
      createElement('p', '文本组件'),
      createElement('p', this.data.content)
    ]);
  }
};

Vue.component('smart-component', {
  //设置为函数化组件
  functional: true,
  render: function (createElement, context) {
    function get() {
      var data = context.props.data;

      console.log("smart-component/type:" + data.type);
      //判断是哪一种类型的组件
      switch (data.type) {
        case 'img':
          return imgOptions;
        case 'video':
          return videoOptions;
        case 'text':
          return textOptions;
        default:
          console.log("data 类型不合法：" + data.type);
      }
    }

    return createElement(
      get(),
      {
        props: {
          data: context.props.data
        }
      },
      context.children
    )
  },
  props: {
    data: {
      type: Object,
      required: true
    }
  }
})

var app = new Vue({
  el: '#app',
  data: {
    data: {}
  },
  methods: {
    change: function (type) {
      console.log("输入类型：" + type);
      switch (type) {
        case 'img':
          this.data = {
            type: 'img',
            url: 'http://pic-bucket.ws.126.net/photo/0001/2019-02-07/E7D8PON900AO0001NOS.jpg'
          }
          break;
        case 'video':
          this.data = {
            type: 'video',
            url: 'http://wxapp.cp31.ott.cibntv.net/6773887A7F94A71DF718E212C/03002002005B836E73A0C5708529E09C1952A1-1FCF-4289-875D-AEE23D77530D.mp4"data 类型不合法：" + type);
      }

    }
  },
  created: function () {
    //默认为图片组件
    this.change('img');
  }

});

return createElement(
  get(),
  {
    props: {
      data: context.props.data
    }
  },
  context.children
)