Avoid mutating a prop directly since the value will be overwritten whenever the parent ...
错误：[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: "grants" (found in component )
出错原因：
父组件：
子组件：
使用了element UI的transfer穿梭框组件，绑定了已授权的角色id，从父组件传导子组件的prop中
此时如果操作赋权，将会改变绑定的grants属性，引起以上报错信息。子组件中更改绑定的prop值最好使用计算属性computed解决。
解决方式:
computed: {grants_: {get() {return this.grants;},set(val) {//grants_改变由父组件控制this.$emit("on-change-grant", val);}}}将绑定的grants改为绑定计算属性值grants_，此时的set方法不能写 this.grants = val,这样和直接绑定prop中的grants有什么两样呢？所以，最好要将此时的grants_改变交给父组件控制，通过父组件来改变prop的grants值。完美解决这个错误。
父组件中修改：
methods里面添加：
表达能力有限，第一次遇到这个问题所以将它写在博客中，将错误原因和解决方式截图显示出来方便大家理解，有什么不对的地方大家可以评论我一起学习。
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