onMounted的用法

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<!DOCTYPE html>
<div id="app">
  <parent></parent>
</div>
<script src="https://unpkg.com/vue@next"></script>
<script>
    const {provide, inject, ref, onMounted} = Vue;
    const app = Vue.createdApp({});

    const msgKey = Symbol();
    const helloKey = Symbol();

    app.component('parent', {
        setup() {
          const msg = ref('Java无难事');
          const sayHello = function (name) {
               console.log("Hello, " + name)
          }

          provide(msgKey, msg);
          provide(helloKey, sayHello);
          return {
            msg
          }
        },
        template: '<child/>'
    })

    app.component('child', {
      setup(){
        const message = inject(msgKey, ref('VC++ 深入详解'));
        const hello = inject(helloKey);
        onMounted(() => hello('zhangsan'));

        return {
          message
        }
      },
      template: '<p>{{ message }}</p>'
    })
    
    app.mount('#app')

</script>


</html>

也不行

<!DOCTYPE html>
<div id="app">
  
</div>
<script src="https://unpkg.com/vue@next"></script>
<script>
    const {provide, inject, ref, onMounted} = Vue;
    const app = Vue.createdApp({});

    const msgKey = Symbol();
    const helloKey = Symbol();

    app.component('parent', {
        setup() {
          const msg = ref('Java无难事');
          const sayHello = function (name) {
               console.log("Hello, " + name)
          }

          provide(msgKey, msg);
          provide(helloKey, sayHello);
          return {
            msg
          }
        },
        template: '<child/>'
    })

    app.component('child', {
      setup(){
        const message = inject(msgKey, ref('VC++ 深入详解'));
        const hello = inject(helloKey);
        onMounted(() => hello('zhangsan'));

        return {
          message
        }
      },
      template: '<p>{{ message }}</p>'
    })

    const vm = app.mount('#app')

</script>


</html>

多谢了一个d,改好了

<!DOCTYPE html>
<div id="app">
  <parent></parent>
</div>

<script src="https://unpkg.com/vue@next"></script>
<script>
    const {provide, inject, ref, onMounted} = Vue;
    const app = Vue.createApp({});

    const msgKey = Symbol();
    const helloKey = Symbol();

    app.component('parent', {
        setup() {
          const msg = ref('Java无难事');
          const sayHello = function(name) {
               console.log("Hello, " + name)
          }

          provide(msgKey, msg);
          provide(helloKey, sayHello);
          return {
            msg
          }
        },
        template: '<child/>'
    })

    app.component('child', {
      setup(){
        const message = inject(msgKey, ref('VC++ 深入详解'));
        const hello = inject(helloKey);
        onMounted(() => hello('zhangsan'));

        return {
          message
        }
      },
      template: '<p>{{ message }}</p>'
    })

    const vm = app.mount('#app')

</script>


</html>

加了点料
name也显示一下

<!DOCTYPE html>
<div id="app">
  <parent></parent>
</div>

<script src="https://unpkg.com/vue@next"></script>
<script>
    const {provide, inject, ref, onMounted} = Vue;
    const app = Vue.createApp({});

    const msgKey = Symbol();
    const helloKey = Symbol();

    app.component('parent', {
        setup() {
          const msg = ref('Java无难事');
          const sayHello = function(name) {
               console.log("Hello, " + name)
          }

          provide(msgKey, msg);
          provide(helloKey, sayHello);
          return {
            msg
          }
        },
        template: '<child/>'
    })

    app.component('child', {
      setup(){
        const message = inject(msgKey, ref('VC++ 深入详解'));
        const hello = inject(helloKey);
        onMounted(() => hello('zhangsan'));

        return {
          message,
          name
        }
      },
      template: `<p>{{ message }}</p>
                 <p>Hello, {{ name }} </p>`
    })

    const vm = app.mount('#app')

</script>


</html>

又乱了

<!DOCTYPE html>
<div id="app">
  <parent></parent>
</div>

<script src="https://unpkg.com/vue@next"></script>
<script>
    const {provide, inject, ref, onMounted} = Vue;
    const app = Vue.createApp({});

    const msgKey = Symbol();
    const helloKey = Symbol();

    app.component('parent', {
        setup() {
          const msg = ref('Java无难事');
          const sayHello = function(name) {
               console.log("Hello, " + name)
          }

          provide(msgKey, msg);
          provide(helloKey, sayHello);
          return {
            msg
          }
        },
        template: '<child/>'
    })

    app.component('child', {
      setup(){
        const message = inject(msgKey, ref('VC++ 深入详解'));
        const hello = inject(helloKey);
        onMounted(() => hello('zhangsan'));

        return {
          message,
          hello
        }
      },
      template: `<p>{{ message }}</p>
                 <p>Hello, {{ name }} </p>`
    })

    const vm = app.mount('#app')

</script>


</html>

为什么在console窗口里改vm VC++这个,window窗口里不改,只有console里改了。

<!DOCTYPE html>
<div id="app">
  <parent></parent>
</div>

<script src="https://unpkg.com/vue@next"></script>
<script>
    const {provide, inject, ref, onMounted} = Vue;
    const app = Vue.createApp({});

    const msgKey = Symbol();
    const helloKey = Symbol();

    app.component('parent', {
        setup() {
          const msg = ref('Java无难事');
          const sayHello = function(name) {
               console.log("Hello, " + name)
          }

          provide(msgKey, msg);
          provide(helloKey, sayHello);
          return {
            msg
          }
        },
        template: '<child/>'
    })

    app.component('child', {
      setup(){
        const message = inject(msgKey, ref('VC++ 深入详解'));
        const hello = inject(helloKey);
        onMounted(() => hello('zhangsan'));

        return {
          message
        }
      },
      template: '<p>{{ message }}</p>'
    })

    const vm = app.mount('#app')

</script>


</html>
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