参考: http://www.cnblogs.com/xxcanghai/p/6124699.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<switchbtn :result="result" @on-result-change="onResultChange"></switchbtn>
<input type="button" value="change" @click="change">
</div>
<script src="node_modules/vue/dist/vue.js"></script>
<script>
Vue.component("switchbtn", {
template: "<div @click='change'>{{myResult?'开':'关'}}</div>",
props: ["result"],
data: function () {
return {
myResult: this.result//①创建props属性result的副本--myResult
};
},
watch: {
result(val) {
this.myResult = val;//②监听外部对props属性result的变更，并同步到组件内的data属性myResult中
},
myResult(val) {
//xxcanghai 小小沧海 博客园
this.$emit("on-result-change", val);//③组件内对myResult变更后向外部发送事件通知
}
},
methods: {
change() {
this.myResult = !this.myResult;
}
}
});
new Vue({
el: "#app",
data: {
result: true
},
methods: {
change() {
this.result = !this.result;
},
onResultChange(val) {
this.result = val;//④外层调用组件方注册变更方法，将组件内的数据变更，同步到组件外的数据状态中
}
}
});
</script>
</body>
</html>原文：https://www.cnblogs.com/iiiiiher/p/9383781.html