ide/state-management.html" rel=" nofollow noreferrer "> https://cn.vuejs.org/v2/guide.
 to solve this problem, we adopt a simple store pattern: 
var store = {
  debug: true,
  state: {
    message: "Hello!"
  },
  setMessageAction (newValue) {
    if (this.debug) console.log("setMessageAction triggered with", newValue)
    this.state.message = newValue
  },
  clearMessageAction () {
    if (this.debug) console.log("clearMessageAction triggered")
    this.state.message = ""
  }
}var vmA = new Vue({
  data: {
    privateState: {},
    sharedState: store.state
  }
})
var vmB = new Vue({
  data: {
    privateState: {},
    sharedState: store.state
  }
})this example is incomplete and I don"t understand how to use it
