Vue组件之间传值

组件之间传值的三种方式

• 父传子
• 子传父
• 非父子组件传值

父传子

父组件

<template>
  <div>
    <child :inputName="name"></child>
  </div>
</template>
<script>
  import child from './child'
  export default {
    components: {
      child
    },
    data () {
      return {
        name: '123'
      }
    }
  }
</script>

子组件

<template>
  <div>
    <span>{{inputName}}</span>
  </div>
</template>
<script>
  export default {
    props:['inputName']
  }
</script>

子传父

子组件

<template>
  <div>
    <span>{{childValue}}</span>
    <input type="button" value="点击触发" @click="childClick">
  </div>
</template>
<script>
  export default {
    data () {
      return {
        childValue: '子组件'
      }
    },
    methods: {
      childClick () {
        this.$emit('childByValue', this.childValue)
      }
    }
  }
</script>

父组件

<template>
  <div>
    <span>{{name}}</span>
    <child v-on:childByValue="childByValue"></child>
  </div>
</template>
<script>
  import child from './child'
  export default {
    components: {
      child
    },
    data () {
      return {
        name: ''
      }
    },
    methods: {
      childByValue: function (childValue) {
        // childValue就是子组件传过来的值
        this.name = childValue
      }
    }
  }
</script>

非父子组件传值

需要引入一个公共的js，作为中间仓库来传值，不然路由组件之间达不到传值的效果

公共的js

import Vue from 'vue'
export default new Vue()

组件A

<template>
  <div>
    <span>{{elementValue}}</span>
    <input type="button" value="点击触发" @click="elementByValue">
  </div>
</template>
<script>
  import Bus from 'bus.js'
  export default {
    data () {
      return {
        elementValue: 4
      }
    },
    methods: {
      elementByValue: function () {
        Bus.$emit('val', this.elementValue)
      }
    }
  }
</script>

组件B

<template>
  <div>
    <span>{{name}}</span>
  </div>
</template>
<script>
  import Bus from './bus.js'
  export default {
    data () {
      return {
        name: 0
      }
    },
    mounted: function () {
      Bus.$on('val', (data) => {
        this.name = data
      })
    },

  }
</script>