vue问题错误:[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the
报错: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 mutate...
报错:
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: "selectType"
根据教程vue1.0,ratingselect组件触发自定义事件在父组件food中由event监听事件,实现selectType和onlyContent的传值。
methods: {
select (type, event) {
if (!event._constructed) {
return;
}
this.selectType = type;
this.$emit('ratingtype-select', this.selectType);
},
toggleContent (event) {
if (!event._constructed) {
return;
}
this.onlyContent = !this.onlyContent;
this.$emit('content-toggle', this.onlyContent);
}
}
在父组件food中代码
,
events : {
'ratingtype-select' (type) {
this.selectType = type;
this.$nextTick(() => {
this.scroll.refresh();
});
});
'content-toggle' (onlycontent) {
this.onlyContent = onlycontent;
this.$nextTick(() => {
this.scroll.refresh();
});
});
}
- 首先vue2.0里面已经弃用了events,事件处理在created钩子中被注册。
- 报错ratingselect组件中的变量需要在data或computed中重写。
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: "selectType"
对应的解决方法
- 在ratingselect标签内监听事件并在methods内写回调函数。
- 将selectType和onlyContent这俩个需要做修改处理的变量在data中重写。
ratingselect子组件接收数据,修改数据,然后设置派发事件将修改后的数据派发的父组件
ratingSelect.vue(子组件中),在子组件中除了用props接收父子间的数据之外,还要在data中定义两个变量,将props中接收到的值赋值给这两个新变量,之后在子组件中改变的都是这两个新的变量
data () {
return {
stype: this.selectType,
ocontent: this.onlyContent
};
}
methods: {
select (type, event) {
if (!event._constructed) {
return;
}
this.stype = type;
this.$emit('ratingevent', 'selectType', this.stype);
},
toggleContent (event) {
if (!event._constructed) {
return;
}
this.ocontent = !this.ocontent;
this.$emit('ratingevent', 'onlyContent', this.ocontent);
}
}
food组件做如下修改
<ratingselect @ratingevent="ratingevent"
ratingevent (type, data) {
this[type] = data;
this.$nextTick(() => {
this.scroll.refresh();
// 异步让滚动刷新
});
}
会不会好奇不是说把event的事件处理在created中注册了吗,为啥不用created呢?
我参考众多的资料,觉得是因为created函数的生命周期在实例创建之后,而此时实例已经创建完成,不会调用该函数,还有一种方式是可以在触发事件的方式改为事件中心,这样应该可以监听到。
目前大多数的事件处理通过v-on来监听,调用对应的回调函数实现.
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