vue如何實(shí)現(xiàn)購(gòu)物車功能

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如圖，需要有加入購(gòu)物車的標(biāo)識(shí)思路如下：點(diǎn)擊購(gòu)物車按鈕時(shí)將商品的id,title,imgUrl(海報(bào)圖),flag（標(biāo)識(shí)符，flag非常重要，為以后復(fù)選框判斷是否選中做參考）變成一個(gè)數(shù)組形式，cart，傳入vuex

<template>
    <div>
  <van-goods-action>
    <van-goods-action-icon icon="chat-o" text="客服" @click="onClickIcon" />
    <van-goods-action-icon icon="cart-o" text="購(gòu)物車" @click="onClickIcon" />
    <van-goods-action-button
      type="warning"
      text="加入購(gòu)物車"
      @click="onClickButton"
    />
    <van-goods-action-button
      type="danger"
      text="立即購(gòu)買"
      @click="onClickButton"
    />
  </van-goods-action>
    </div>
</template>

<script>
  import { Toast } from 'vant';
  import { GoodsAction, GoodsActionIcon, GoodsActionButton } from 'vant';
  export default {
    name: 'tabs',
    data(){
      return{

      }
    },
    props:{
      id:String,
      current:String,
      title:String,
      imgUrl:String
    },
    components:{
      [Toast.name]: Toast,
      [GoodsAction.name]: GoodsAction,
      [GoodsActionIcon.name]: GoodsActionIcon,
      [GoodsActionButton.name]: GoodsActionButton
    },
     methods: {
        onClickIcon() {
          Toast('點(diǎn)擊圖標(biāo)');
        },
        onClickButton() {
          var cart={id:this.id,current:this.current,num:1,title:this.title,imgUrl:this.imgUrl,flag:true}
          this.$store.commit('addCart',cart)
          Toast('已加入購(gòu)物車');
        },
      },
    }
</script>

<style>
</style>

2.vuex如下

import Vue from 'vue'
import Vuex from 'vuex'
import mutations from './mutations.js'
Vue.use(Vuex)
export default new Vuex.Store({
  state: {
    cart:[],
    money:0,
    allchecked:true
  },
  mutations,
})

export default{、
//判斷是否已經(jīng)加入過(guò)購(gòu)物車，如果加入過(guò)，則該產(chǎn)品數(shù)量加一，若沒(méi)有加入過(guò)，將產(chǎn)品加入cart中
  addCart(state,data){
    for(var i=0;i<state.cart.length;i++){
      if(state.cart[i].id==data.id){
        state.cart[i].num+=data.num
        return
      }
    }
    state.cart.push(data)
  },
  //該函數(shù)為數(shù)字+1
  addCartNum(state,index){
    state.cart[index].num++
  },
    //該函數(shù)為數(shù)字-1
  jianCartNum(state,index){
    if(state.cart[index].num==1){return;}
    state.cart[index].num--
  },
}

3.購(gòu)物車

思路如下：若沒(méi)有產(chǎn)品則顯示無(wú)產(chǎn)品，若有產(chǎn)品在購(gòu)物車?yán)?，則可進(jìn)行增刪加減

<template>
  <div class="bg">
    <div class="bgCart" v-if="isGood">
      <div class="cartAd">
        <h4>
          購(gòu)物車
        </h4>
        <div v-if="select">
          <div class="admin" @click="onAdmin">管理</div>
        </div>
        <div v-if="!select">
          <div class="admin" @click="onOk">完成</div>
        </div>
      </div>
      <van-checkbox-group v-model="result" ref="checkboxGroup">
        <div class="cart" v-for="(item,index) in cartList" :key="index">
          <van-checkbox :name="item.id" class="checkbox" checked-color="red" v-model="item.flag" @click="chooseChange(item.id, item)">
          </van-checkbox>
          <div class="box">
            <img class="img" :src="baseUrl+item.imgUrl" />
            <div class="wraper">
              <div class="title">{{item.title}}</div>
              <div class="container">
                <div class="money">￥{{item.current}}</div>
                <div>
                  <span class="jian" @click="jian(index)">
                    <span class="jianAdj"> -</span>
                  </span>
                  <span>{{item.num}}</span>
                  <span class="jia" @click="add(index)">
                    <span class="jiaAdj"> +</span>
                  </span>
                </div>
              </div>
            </div>
          </div>
        </div>
      </van-checkbox-group>
      <div class="order" v-if="select">

        <van-submit-bar :price="getAll" button-text="提交訂單">
          <van-checkbox v-model="allchecked" checked-color="red" @click="allOrder">全選/取消</van-checkbox>
        </van-submit-bar>
      </div>
      <div class="order" v-if="!select">
        <van-submit-bar :price="getAll" button-text="刪除" @submit="del">
          <van-checkbox v-model="allchecked" checked-color="red" @click="allOrder">全選/取消</van-checkbox>
        </van-submit-bar>
      </div>
 </div>
 <div v-if="!isGood" class="noGood">
  <h4>
    購(gòu)物車
  </h4>
  <img src="../../../static/img/cart.jpg"/>
   <span class="add">
      您還沒(méi)有添加任何產(chǎn)品哦
   </span>
   <van-button round  type="danger">去逛逛</van-button>
 </div>
      <bottom></bottom>
  </div>
</template>

<script>
  import {
    Checkbox,
    CheckboxGroup
  } from 'vant';
  import {
    SubmitBar
  } from 'vant';
  import {
    Button
  } from 'vant';
  export default {
    name: 'cart',
    data() {
      return {
        result: [],
        cartList: [],
        select: true,
        money: 0,
        results: [],
        baseUrl: this.common.baseUrl,
        allchecked: this.$store.state.allchecked,
        isGood:true
      }
    },
    components: {
      [SubmitBar.name]: SubmitBar,
      [Button.name]: Button,
      [Checkbox.name]: Checkbox,
      [CheckboxGroup.name]: CheckboxGroup,
      bottom: () => import('./components/bottom.vue')
    },
    computed: {
      getAll() {
        var money = 0
        this.$store.state.cart.forEach(item => {
          if (item.flag) {
            money += (item.num * item.current) * 100
          }
        })
        return money
      }
    },
    methods: {
      //選擇單個(gè)復(fù)選框（非常重要）
     //由于我進(jìn)來(lái)是使復(fù)選框全選，則在第一次點(diǎn)擊的時(shí)候使得flag=false
      chooseChange(i, item) {
        if (this.result.indexOf(i) > -1) {
          var arrs = this.result.filter(function(item) {
            return item != i;
          });
          this.result = arrs;
          item.flag = false;
        } else {
          this.result.push(i);
          item.flag = true;
        }
        //判斷單個(gè)和全部，若單個(gè)全選，則this.$store.state.allchecked為true
        if (this.result.length < this.$store.state.cart.length) {
          this.$store.state.allchecked = false;
          this.allchecked = this.$store.state.allchecked;
        } else {
          this.$store.state.allchecked = true;
          this.allchecked = this.$store.state.allchecked;
        }
      },
      //全選狀態(tài)
      allOrder() {
        //如果選擇狀態(tài)為選中的時(shí)候，設(shè)置this.$store.state.allchecked=false變成未選中
        if (this.$store.state.allchecked) {
          this.$store.state.cart.forEach(item => {
            item.flag = false;
          })
          this.result = [];
          this.$store.state.allchecked = false;
          this.allchecked = this.$store.state.allchecked;
        } else {
          this.$store.state.cart.forEach(item => {
            item.flag = true;
            if (this.result.indexOf(item.id) < 0) {
              this.result.push(item.id);
            }
          })
          this.$store.state.allchecked = true;
          this.allchecked = this.$store.state.allchecked;
        }
      },
      //數(shù)字+
      add(index) {
        this.$store.commit('addCartNum', index)

      },
      //數(shù)字減
      jian(index) {
        this.$store.commit('jianCartNum', index)
      },
      //點(diǎn)擊管理
      onAdmin() {
        this.select = false
      },
      //點(diǎn)擊完成
      onOk() {
        this.select = true
        if(this.result.length==0){
          console.log(1)
          this.isGood=false
        }else{
           console.log(this.result)
        }
      },
      //刪除
      del() {
        if (this.result.length == this.$store.state.cart.length) {
          this.$store.state.cart.splice(0, this.result.length)
          this.result.splice(0, this.result.length)
        } else {
          this.$store.state.cart.forEach(item => {
            if (item.flag) {
              this.$store.state.cart.splice(item, 1)
              this.result.splice(item.id, 1)
            }
          })
        }
      }
    },
    created() {
      this.cartList = this.$store.state.cart
      if (this.$store.state.allchecked) {
        for (var i = 0; i < this.$store.state.cart.length; i++) {
          this.result.push(this.$store.state.cart[i].id)
        }
      }
      if(this.result.length==0){
        this.isGood=false
      }
    }
  }
</script>

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