Vue 渲染函数

Vue 推荐在绝大多数情况下使用模板来创建你的 HTML。然而在一些场景中，你真的需要 JavaScript 的完全编程的能力。这时你可以用渲染函数，它比模板更接近编译器。

一 项目结构

二 App组件

<template>
  <div id="app">
    <fruit fruitName="Durian" :level="2">
      very  delicious!
    </fruit>
  </div>
</template>

<script>
import "./components/Fruit.js";
export default {
  name: "App"
};
</script>

<style lang="scss">
</style>

三 Fruit组件

import Vue from "vue";
import Durian from "./Durian.vue";
import Mongo from "./Mongo.vue";

Vue.component("fruit", {
  props: {
    fruitName: {
      type: String,
      required: true
    },
    level: {
      type: Number,
      required: true
    }
  },
  data() {
    return {
      shop: "水果店"
    };
  },
  render(createElement) {
    const { fruitName, level, shop, $slots, nativeClickHandler } = this;
    const ele = fruitName === "Durian" ? Durian : Mongo;
    return createElement(
      ele,
      {
        class: {
          favorFruit: true
        },
        style: "color:gold;font-style:italic;",
        attrs: {
          id: "favorFruit"
        },
        nativeOn: {
          click: nativeClickHandler
        },
        scopedSlots: {
          shop(props) {
            return createElement("h6", shop);
          }
        }
      },
      [createElement("h" + level, fruitName), $slots.default]
    );
  },
  methods: {
    nativeClickHandler() {
      console.log("native click");
    }
  }
});

四 Durian组件

<template>
    <div>
        <slot/>
        <slot name="shop"/>
    </div>
</template>
<script>
export default {
  name: "Durian"
};
</script>

五 Mongo组件

<template>
    <div>
        <slot/>
        <slot name="shop"/>
    </div>
</template>
<script>
export default {
  name: "Mango"
};
</script>

六 运行效果