$emit和$on可以实现组件之间的传值,我们知道父组件传值给子组件使用props,但是不允许子组件传值给父组件,这时候使用这个就可以实现了。
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注意:$emit和$on的事件必须在一个公共的实例上,才能够触发。
例子:我要实现某个系统的通讯录功能,在web端我们可以使用基于jQuery的ztree插件实现目录的展现,但是在vuejs框架里面,tree目录需要通过递归组件实现。
1、现在有两个组件,父组件contact_index.vue,子组件cust_tree.vue

2、点击父组件里面的选择银行,跳出银行树目录结构(使用vuejs的递归组件实现),这里面需要做两种传值:
(1)父组件通过props将树目录的数据list传到子组件中形成目录结构的展示;
(2)子组件里面通过点击相应的银行请求查询银行的通讯录,这里面需要将点击的银行的机构代码回传给父组件,父组件接收后通过input将机构代码提交给后台请求查询;
第一种是父组件给子组件传值使用props即可,现在我们来谈谈第二种情况,如何将子组件的值回传给父组件。
网上百度千篇一律全是使用$emit来实现,可是都有一个严重的误区没有给别人说明,开始我都按照搜索的结果进行操作,都会出现子组件$emit后父组件没有监听到函数的变化,研究了好久才发现$emit和$on的事件必须在一个公共的实例上,才能够触发。我的操作如下:
首先在src目录下新加bus.js作为一个公共的实例
import Vue from 'vue'
export var bus = new Vue()
其次,父组件在created里面定义$on监听事件
//父组件与子组件都要import bus.js
import {bus} from '../../bus.js'created(){
bus.$on('custTreeSay',(id)=>{
//监听传值--机构代码
this.instCode = id;
//关闭弹窗
this.popupVisibleTree = false;
//调用查询方法刷新通讯录列表
this.query();
});
bus.$on('custTreeSayName',(name)=>{
//监听传值--机构名称
this.instName = name;
});
}
最后,在子组件中定义点击事件,调用父组件方法通过$emit将相应值传给父组件
基本
文件
流程
错误
SQL
调试
- 请求信息 : 2026-05-22 04:09:00 HTTP/1.1 GET : /article/podjed.html
- 运行时间 : 2.5415s ( Load:0.0238s Init:0.6502s Exec:1.8573s Template:0.0101s )
- 吞吐率 : 0.39req/s
- 内存开销 : 2,224.85 kb
- 查询信息 : 12 queries 5 writes
- 文件加载 : 36
- 缓存信息 : 0 gets 0 writes
- 配置加载 : 130
- 会话信息 : SESSION_ID=9smaaeopnvbafd3b1ivskudds3
- /www/wwwroot/tsicrk.com/index.php ( 1.09 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/ThinkPHP.php ( 4.61 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Think.class.php ( 12.26 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Mode/common.php ( 2.82 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Common/functions.php ( 53.56 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Hook.class.php ( 4.01 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/App.class.php ( 13.49 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Dispatcher.class.php ( 14.79 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Route.class.php ( 13.36 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Controller.class.php ( 11.23 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.88 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.91 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Conf/convention.php ( 11.15 KB )
- /www/wwwroot/tsicrk.com/App/Common/Conf/config.php ( 2.14 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Lang/zh-cn.php ( 2.55 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Conf/debug.php ( 1.49 KB )
- /www/wwwroot/tsicrk.com/App/Home/Conf/config.php ( 0.31 KB )
- /www/wwwroot/tsicrk.com/App/Home/Common/function.php ( 3.33 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ReadHtmlCacheBehavior.class.php ( 5.62 KB )
- /www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php ( 6.02 KB )
- /www/wwwroot/tsicrk.com/App/Home/Controller/CommController.class.php ( 1.60 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Model.class.php ( 60.11 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db/Driver/Pdo.class.php ( 16.74 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Cache.class.php ( 3.83 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.87 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template.class.php ( 28.16 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.40 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )
- /www/wwwroot/tsicrk.com/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 17.71 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )
- [ app_init ] --START--
- Run Behavior\BuildLiteBehavior [ RunTime:0.000008s ]
- [ app_init ] --END-- [ RunTime:0.000133s ]
- [ app_begin ] --START--
- Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.002564s ]
- [ app_begin ] --END-- [ RunTime:0.002640s ]
- [ view_parse ] --START--
- [ template_filter ] --START--
- Run Behavior\ContentReplaceBehavior [ RunTime:0.000070s ]
- [ template_filter ] --END-- [ RunTime:0.000099s ]
- Run Behavior\ParseTemplateBehavior [ RunTime:0.007014s ]
- [ view_parse ] --END-- [ RunTime:0.007043s ]
- [ view_filter ] --START--
- Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000172s ]
- [ view_filter ] --END-- [ RunTime:0.000187s ]
- [ app_end ] --START--
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
[ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
[ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
[ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= )
- [8] Undefined index: pid /www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php 第 47 行.
- [8] Undefined index: db_host /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 120 行.
- [8] Undefined index: db_port /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 121 行.
- [8] Undefined index: db_name /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 122 行.

2.5415s
