简单实现Vuex

let Vue;

class Store {
     
	constructor(options) {
     
		// state的响应式处理
		this.state = new Vue({
     
			data: options.state;
		});
		this._mutations = options.mutations;
		this.actions = options.actions;
		this.commit = this.commit.bind(this);
		this.dispatch = this.dispatch.bind(this);
		this.getters = {
     };
		this.getters && this.handleGetters(options.getters)
	};
	handleGetters(getters) {
     
		Object.keys(getters).map(item => {
     
			Object.defineProperty(this.getters, item, {
     
				get :() => getters[item](this.state)
			})
		})
	};
	commit( type, payload ) {
     
		const Env = this._mutations[type];
		
		if( !Env )  {
     
			console.err(''xxxxxxxxx);
		}
		Env(this,state, payload);
	};
	dispatch( type, payload) {
     
		const Env = this.actions[type];
		
		if( !Env )  {
     
			console.err(''xxxxxxxxx);
		}
		Env(this,state, payload);
	}

}

const install = (_Vue) => {
     
	Vue = _Vue;
	Vue.mixin({
     
		beforeCreate() {
     
			if( this,$options.store) {
     
				Vue.prototype.$store = this.$options.store;
			}
		}
	})
};
export default {
     Store,  install}
		```