Vue使用props父子组件传递数据

<template>
   <div>
      <demo :msg='msgData' :math = 'mathData' ></demo>
   </div>
</template>
<script>
import Demo from './Demo.vue'
   export default {
     data () {
       return  {
          msgData:'从父组件接收来的数据',
          mathData : 2
       }
     },
     components : {
       Demo
     }
   }
</script>

<template>
  <div>
     <p>{{msg}}</p>
     <p>{{math}}</p>
  </div>
</template>

<script>
export default {
  name: 'demo',
  props: [ 'msg' , 'math'],
}
</script>

<template>
   <div>
      <demo :fn = 'myFunction' ></demo>
   </div>
</template>
<script>
import Demo from './Demo.vue'
   export default {
     components : {
       Demo
     },
     methods: {
       myFunction () {
           console.log('vue')
       }
     }
   }
</script>

<template>
  <div>
     <button @click='fn'>按钮</button>
  </div>
</template>

<script>
export default {
  name: 'demo',
  props: [ 'fn' ],
}
</script>

<template>
   <div>
      <demo v-bind= 'msg'  ></demo>
   </div>
</template>
<script>
import Demo from './Demo.vue'
   export default {
     components : {
       Demo
     },
     data () {
       return {
         msg : {a:1,b:2}
       }
     }
   }
</script>

<template>
  <div>
     <button>按钮</button>
  </div>
</template>

<script>
export default {
  name: 'demo',
  props: ['a','b'],
  created () {
     console.log(this.a)
     console.log(this.b)
  },
}
</script>