# Vuex 原理解析
<html>
<head>
<title>vuex 原理解析</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="root">{{data}}</div>
<div id="root2">{{data2}}</div>
<div id="root3">
<button @click="change">change</button>
</div>
<script>
function registerPlugin(Vue) {
const vuex = {}
vuex._vm = new Vue({
data: {
message: 'hello vue.js'
}
})
vuex.state = vuex._vm
vuex.mutations = {
setMessage(value) {
vuex.state.message = value
}
}
function init() {
this.$store = vuex
}
Vue.mixin({
beforeCreate: init
})
}
Vue.use(registerPlugin)
new Vue({
el: '#root',
computed: {
data() {
return this.$store.state.message
}
}
})
new Vue({
el: '#root2',
computed: {
data2() {
return this.$store.state.message
}
}
})
new Vue({
el: '#root3',
methods: {
change() {
const newValue = this.$store.state.message + '.'
this.$store.mutations.setMessage(newValue)
}
}
})
</script>
</body>
</html>
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TIP