685 vue3 mixin，extends

认识Mixin

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Mixin的基本使用

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Mixin的合并规则

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全局混入Mixin

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extends

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import { createApp } from 'vue';
import App from './01_mixin和extends/App.vue';
// import App from './02_compositionAPI基础/App.vue';

const app = createApp(App);

// 全局混入Mixin
app.mixin({
  data() {
    return {}
  },
  created() {
    console.log("全局的created生命周期");
  }
});

app.mount("#app");

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App.vue

<template>
  <div>
    <home />
  </div>
</template>

<script>
  import Home from "./pages/Home.vue";

  export default {
    components: {
      Home,
    },
  };
</script>

<style scoped></style>

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01_mixin基本使用.vue

<template>
  <div>
    <h2>{{ message }}</h2>
    <button @click="foo">按钮</button>
  </div>
</template>

<script>
  import { demoMixin } from "./mixins/demoMixin";

  export default {
    mixins: [demoMixin],
    data() {
      return {
        title: "Hello World",
      };
    },
    methods: {},
  };
</script>

<style scoped></style>

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02_mixin合并规则.vue

<template>
  <div>
    <h2>{{ message }}</h2>
    <button @click="foo">foo</button>
  </div>
</template>

<script>
  import { demoMixin } from "./mixins/demoMixin";

  export default {
    mixins: [demoMixin],
    data() {
      return {
        title: "Hello World",
        message: "Hello App",
      };
    },
    methods: {
      foo() {
        console.log("app foo");
      },
    },
    computed: {},
    watch: {},
    created() {
      console.log("App created 执行");
    },
  };
</script>

<style scoped></style>

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demoMixin.js

export const demoMixin = {
  data() {
    return {
      message: "Hello DemoMixin"
    }
  },
  methods: {
    foo() {
      console.log("demo mixin foo");
    }
  },
  created() {
    console.log("执行了demo mixin created");
  }
}

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Home.vue

<template>
  <div>
    Home Page
    <h2>{{ title }}</h2>
    <button @click="bar">按钮</button>
  </div>
</template>

<script>
  import BasePage from "./BasePage.vue";

  export default {
    extends: [BasePage],
    data() {
      return {
        content: "Hello Home",
      };
    },
  };
</script>

<style scoped></style>

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BasePage.vue

<template>
  <div>
    <h2>哈哈哈哈啊</h2>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        title: "Hello Page",
      };
    },
    methods: {
      bar() {
        console.log("base page bar");
      },
    },
  };
</script>

<style scoped></style>

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