Vue - prop

prop作用

prop的作用是父组件单向传递数据给子组件。

静态传递

子组件

<tenplate>
  <div>
    <h1>{{ msg }}</h1>
  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  props: {
    msg: String
  }
}
</script>

父组件

<template>
  <div id="app">
    <HelloWorld msg="hello world" />
  </div>
</template>

<script>
export default {
  name: "App",
  components: {
    HelloWorld,
  },
};
</script>

动态传递字符串

子组件

<tenplate>
  <div>
    <h1>{{ msg }}</h1>
  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  props: {
    msg: String
  }
}
</script>

父组件

<template>
  <div id="app">
    <HelloWorld :msg="hello" />
  </div>
</template>

<script>
export default {
  name: "App",
  components: {
    HelloWorld,
  },
  data() {
    return {
      hello: "hello world",
    };
  },
};
</script>

动态传递数组

子组件

<template>
  <div class="hello">
    <ul>
      <li v-for="item in hellos" :key="item">{{ item }}</li>
    </ul>
    <h1>{{ msg }}</h1>
   </div>
</template>

<script>
export default {
  name: "HelloWorld",
  props: {
    hellos: String,
    msg: String
  },
};
</script>

父组件

<template>
  <div id="app">
    <HelloWorld :msg="hello" :hellos="hellos" />
  </div>
</template>

export default {
  name: "App",
  components: {
    HelloWorld,
  },
  data() {
    return {
      hello: "hello world",
      hellos: ["111", "222", "333"],
    };
  },
};
</script>

动态传递对象

子组件

<template>
  <div class="hello">
    <h1>{{ msg.id }}</h1>
    <h2>{{ msg.name }}</h2>
   </div>
</template>

<script>
export default {
  name: "HelloWorld",
  props: {
    msg: Object,
  },
};
</script>

父组件

<template>
  <div id="app">
    <HelloWorld :msg="hello"/>
  </div>
</template>

<script>
export default {
  name: "App",
  components: {
    HelloWorld,
  },
  data() {
    return {
      hello: {
        id: 1,
        name: "wecle",
      },
    };
  },
};
</script>

prop验证

type可以是：
String
Number
Boolean
Array
Object
Date
Funtion
Symbol

子组件

<template>
  <div class="hello">
    <h1>{{ string }}</h1>
    <h1>{{ number }}</h1>
    <h1>{{ boolean }}</h1>
    <h1>{{ array }}</h1>
    <h1>{{ object }}</h1>
  </div>
</template>

<script>
export default {
  name: "HelloWorld",
  props: {
    string: {
      type: String,
    },
    number: {
      type: Number,
    },
    boolean: {
      type: Boolean,
    },
    array: {
      type: Array,
    },
    object: {
      type: Object,
    },
  },
};
</script>

父组件

<template>
  <div id="app">
    <HelloWorld
      :string="string"
      :number="number"
      :boolean="boolean"
      :array="array"
      :object="object"
    />
  </div>
</template>

<script>
export default {
  name: "App",
  components: {
    HelloWorld,
  },
  data() {
    return {
      string: "验证字符串",
      number: 123456,
      boolean: true,
      array: ["这是", "一个", "数组"],
      object: {
        id: 1,
        name: "验证对象",
      },
    };
  },
};
</script>