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Vue 'computed' 选项


示例

computed 选项内使用计算属性来显示相应的按钮文本。

export default {
  data() {
    return {
      msg: 'Hello World!',
      showMsg: false
    };
  },
  computed: {
    btnText() {
      if( this.showMsg ) {
        return 'Hide'
      }
      else {
        return 'Show'
      }
    }
  }
};
运行示例 »

定义和用法

The computed 选项是一个对象,其中包含在 Vue 实例上声明的所有计算属性。

计算属性通常是只读的(参见上面的示例),但可以将计算属性定义为包含 getset 函数的对象,这意味着计算属性也可以被写入。

注意:在声明计算属性时,应避免使用箭头函数,因为 Vue 实例无法使用 this 关键字从箭头函数内部访问。


相关页面

Vue 教程:Vue 计算属性

Vue 教程:Vue v-on 指令


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