Value transfer between non parent and child components (bus / bus / publish subscribe mode / observer mode)

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    < title > non parent-child component value transfer (bus / bus / publish subscribe mode / observer mode) < / Title >
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<!-- Use vuex or bus mechanism to solve the problem of value transfer of non parent and child components -- >
<!-- Case description: when you click Dell, you will see Lee. When you click Lee, Dell will become Lee

Transfer between two unrelated components
    <div id="app">
        <child content="Dell"></child>
        <child content="Lee"></child>
<script src="../node_modules/vue/dist/vue.min.js"></script>
    Vue.prototype.bus = new Vue()

            return {
                selfContent: this.content
        template:'<div @click="handleClick">{{selfContent}}</div>',

                //1. I want to pass the current this.content to another component
            var this_ = this
            //2. Monitor the change time in the bus
            //3. Note: we cannot modify the value passed from the parent component, such as content. We define the attribute in data. If this.content is stored in it, we can operate this attribute
            this.bus.$on('change',function (msg) {
                this_.selfContent = msg
    let app = new Vue({



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