state:{
    user_name:"",
    newslist:[],
    newsdetail:{}
  },

<script>
  export default{
    // 创建的时候[生命周期里]
    created(){
      this.$http.get("http://localhost/newsdetail.php?id="+this.$route.params.newsid).then(function(res){
        this.$store.state.newsdetail = res.body;
      },function(res){
        // 处理请求失败
      });
    },
  }
</script>

<div class="page-header">
  <h2>{{this.$store.state.newsdetail.title}}<small>{{this.$store.state.newsdetail.pubtime}}</small></h2>
  <p>点赞数:{{this.$store.state.newsdetail.agree}} <button class="btn btn-success">点赞</button></p>
  <p>{{this.$store.state.newsdetail.desc}}</p>
</div>

import Vuex from 'vuex';
Vue.use(Vuex);

const vuex_store = new Vuex.Store({
  state:{
    user_name:"",
    newslist:[],
    newsdetail:{}
  },
  mutations:{
    showUserName(state){
      alert(state.user_name);
    },
    setAgree(state,agreeNum){
      state.newsdetail.agree = agreeNum;
    }
  },
  actions:{
    agree(context,newsid){
      // 进行请求,获取点赞后的agree字段属性值
      Vue.http.post("http://localhost/agree.php",{newsid:newsid},{emulateJSON:true}).then(function (res) {
        // 处理业务
        // 调用上面setAgree方法更新点赞数
        context.commit("setAgree",res.body.agree);
      },function(){})
    }
  },
  getters:{
    getNews(state){
      return state.newslist.filter(function (news) {
        return !news.isdeleted;
      })
    }
  }
})

    agree(context,newsid){
      // 进行请求,获取点赞后的agree字段属性值
      Vue.http.post("http://localhost/agree.php",{newsid:newsid},{emulateJSON:true}).then(function (res) {
        // 处理业务
        // 调用上面setAgree方法更新点赞数
        context.commit("setAgree",res.body.agree);
      },function(){})
    }

<button class="btn btn-success" @click="submitAgree">点赞</button>

    methods:{
      submitAgree(){
        // 组件了调用actions里定义的agree方法
        this.$store.dispatch("agree",this.$store.state.newsdetail.id)
      }
    }

<template>
  <div class="news-detail">
    <div class="row">
      <div class="page-header">
        <h2>{{this.$store.state.newsdetail.title}}<small>{{this.$store.state.newsdetail.pubtime}}</small></h2>
        <p>点赞数:{{this.$store.state.newsdetail.agree}} <button class="btn btn-success" @click="submitAgree">点赞</button></p>
        <p>{{this.$store.state.newsdetail.desc}}</p>
      </div>
    </div>
  </div>
</template>

 
 

<script>
  export default{
    // 创建的时候[生命周期里]
    created(){
      this.$http.get("http://localhost/newsdetail.php?id="+this.$route.params.newsid).then(function(res){
        this.$store.state.newsdetail = res.body;
      },function(res){
        // 处理请求失败
      });
    },
    methods:{
      submitAgree(){
        // 组件了调用actions里定义的agree方法
        this.$store.dispatch("agree",this.$store.state.newsdetail.id)
      }
    }
  }
</script>

{"status":"success","agree":100}