eventBus使用遇到的坑

**问题：**通过eventBus传递的参数，在子组件的methods中无法通过this.使用。
**思路：**考虑组件方法的执行顺序（vue生命周期执行顺序）
**解决办法：**在传递参数的组件外 this.$nextTick

this.$nextTick(() => {Bus.$emit('updateOpt', opt, item)
})

eventBus的使用

创建eventBus.js文件
在需要传递消息的兄弟组件引入该js文件
传递消息 bus.$emit(“test”,param1,param2…)
接收消息 bus.$on(“test”,funciton({ //逻辑 }))

代码如下：

<!-- 父组件 -->
<template><div><a></a><b></b></div>
</template><script>
import a from "./ePassList/a.vue";
import b from "./ePassEdit/b.vue";
export default {components: {a,b,},
}
</script><style></style>

//eventBus.js文件
import Vue from 'vue'export default new Vue()

<!-- 子组件a 传递消息import Bus from "../eventBus.js"; Bus.$emit('updateOpt', opt, item) -->
<template><div><el-table :data="dataList" size="small" v-loading="loading" border :header-cell-style="{color: '#495060','background-color': '#f8f8f9',}" style="border: 1px solid #dddee1"><el-table-column type="index" label="序号" width="90" align="center"></el-table-column><el-table-column prop="activity_name" label="活动名称" align="center"></el-table-column><el-table-column prop="activity_type" label="活动类型" align="center"></el-table-column><el-table-column prop="activity_publisher" label="发布人" align="center"></el-table-column><el-table-column prop="insert_time" label="发布时间" align="center"></el-table-column><el-table-column prop="update_time" label="更新时间" align="center"></el-table-column><el-table-column prop="action" label="操作" align="center" fixed="right"><el-row slot-scope="scope"><Button type="primary" size="small" @click="operate('editOpt', scope.row)">编辑</Button><Button type="primary" size="small" @click="operate('detailOpt', scope.row)">详情</Button><Button type="primary" size="small" @click="onDelete(scope.row)">删除</Button></el-row></el-table-column></el-table></div>
</template><script>
import Bus from "../eventBus.js";
export default {methods: {//编辑,详情operate(opt, item) {console.log(opt, item);this.$emit('toEdit')this.$nextTick(() => {Bus.$emit('updateOpt', opt, item)})},}
};
</script><style></style>

<!-- 子组件b 接收消息import Bus from "../eventBus.js"; Bus.$on("updateOpt", () => {}); -->
<template></template><script>
import Bus from "../eventBus.js";
export default {data() {return {operate: "",rowData: "",}},created() {Bus.$on("updateOpt", (opt, item) => {console.log(opt, item, 11111);this.operate = opt;this.rowData = item;});},methods:{print(){console.log(this.operate,this.rowData)}}
};
</script><style></style>

涉及到的知识点：nextTick()