@cgj/k-view/src/utils/emitter.js

/** 
 * @description 跨组件通信库
 * @author SoldierAb
 * @since 18-12-28
 * @example 
 * 
 *  child.vue:
 *    this.dispatch('parent',eventName,params);
 * 
 *  parant.vue
 *    this.$on(eventName,params=>{
 *       
 *    });
*/


const broadcast = (componentName, eventName, params) => {
    this.$children.forEach(child => {
        const name = child.$options.name;
        if (name === componentName) {
            child.$emit.apply(child, [eventName].concat(params));
        } else {
            //如果 params 是空数组，接收到的会是 undefined
            broadcast.apply(child, [componentName, eventName].concat([params]));
        }
    });
}
export default {
    methods: {
        dispatch(componentName, eventName, params) {
            let parent = this.$parent || this.$root;
            let name = parent.$options.name;

            while (parent && (!name || name !== componentName)) {
                parent = parent.$parent;
                if (parent) name = parent.$options.name;
            }
            if (parent) parent.$emit.apply(parent, [eventName].concat(params));
        },
        broadcast(componentName, eventName, params) {
            broadcast.call(this, componentName, eventName, params);
        }
    }
};