解决vue传值报错问题

[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "result" (found in component )

vue不推荐直接在子组件中修改父组件传来的props的值，会报错

子组件

props:['demo'],

 data(){
    return {
      currentDemo: this.demo  //通过data, 定义新变量currentDemo, 这样currentDemo的值变更时，不会影响父组件传来的demo的值
    }
  },