项目中遇到父组件传值 activeIndex
<Tabs :tabs="tabs" :activeIndex="activeIndex" ></Tabs>
<script >
export default{
updated(){
let currentRoute=this.$route.name;
var arr=Array.from(this.$store.state.app.tabs);
if(arr.indexOf(currentRoute)!=-1){
this.activeIndex=this.$store.state.app.activeIndex=arr.indexOf(currentRoute).toString();
}
}
}
</script>
子组件接收该值
<template>
<el-tabs type="card" v-model="activeIndex" >
<el-tab-pane v-for="(item,index) in tabs" :label="item" :closable="index==0?false:true" :name="index.toString()" ></el-tab-pane>
</el-tabs>
</template>
<script>
export default{
data(){
return {
tabs:[],
}
},
props:['activeIndex']
}
</script>
6ebadbe553e2f174006b.jpg
参考网址https://juejin.im/entry/5843abb1a22b9d007a97854c
由于父组件updated()方法中更改了this.activeIndex值，update方法除了父组件触发这个方法，子组件也会触发，即子组件会更改activeIndex的值，但是由于父子组件的传递机制，会造成报错Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders....
因此在子组件使用该值时需要经过新变量（currentIndex）重新传递，这样当这个值变更时，不会造activeIndex的更改
//v-model绑定更改
<el-tabs type="card" v-model="currentIndex" >
</el-tabs>
<script>
export default{
data(){
return {
tabs:[],
currentIndex:this.activeIndex //currentIndex接收父组件传来的activeIndex值；
}
},
props:['activeIndex']
}
</script>
