vue使用jsonp获取数据，开发热卖推荐组件

1、安装jsonp

cnpm install --save jsonp

2、jsonp API

jsonp( url, opts, fn )

3、封装jsonp方法

src/assets/js/jsonp.js

import jsonp from 'jsonp';

/*data格式案例
{
    id:1,
    name:'cyy'
}
*/
const parseParam=param=>{
    /*将data格式转换为
    [
        [id,1],
        [name,cyy]
    ]
    */
    let arr=[];
    for(const key in param){
        arr.push([key,param[key]]);
    }
    /*先将data格式转换为
    [
        id=1,
        name=cyy
    ]
    */
   /*再将data格式转换为
    id=1&name=cyy
    */
    return arr.map(value=>value.join("=")).join('&');
}

export default (url,data,options)=>{
    // 如果存在？，则url后面加&；如果不存在则加?
    url+=((url.indexOf('?')<0) ? '?' : '&' ) + parseParam(data);

    return new Promise((resolve,reject)=>{
        
        //jsonp用法，三个参数：jsonp(url,options,callback)
        jsonp(url,options,(err,data)=>{
            if(err){
                reject(err);
            }else{
                resolve(data);
            }
        })
    })
}

4、调用jsonp方法

src/api/recommend.js

import jsonp from 'assets/js/jsonp';

//获取热门推荐数据
export const getHomeRecommend=(page=1,psize=20)=>{
    const url='https://ju.taobao.com/json/tg/ajaxGetItemsV2.json';
    const params={
        page,
        psize,
        type:0,
        frontCatId:''//type和frontCatId是根据给定的淘宝接口来添加的
    }

    //调用jsonp获取数据
    return jsonp(url,params,{
        param:'callback'
    }).then(res=>{
        if(res.code==='200'){
            return res;
        }

        throw new Error('没有成功获取到数据');
    }).catch(err=>{
        if(err){
            console.log(err);
        }
        
    });
    
}

5、通过jsonp获取热门推荐的数据，并渲染到页面上

src/pages/home/recommend.vue

<template>
    <div class="recommend">
        <h3 class="recommend-title">热卖推荐</h3>
        <div class="loading-container" v-if="!recommends.length">
            <me-loading inline />
        </div>
        <ul class="recommend-list">
            <li class="recommend-item" v-for="(item,index) in recommends" :key="index">
                <router-link class="recommend-link" :to="{name:'home-product',params:{id:item.baseinfo.itemId}}">
                    <p class="recommend-pic"><img class="recommend-img" :src="item.baseinfo.picUrl"></p>
                    <p class="recommend-name">{{item.name.shortName}}</p>
                    <p class="recommend-oriPrice"><del>￥{{item.price.origPrice}}</del></p>
                    <p class="recommend-info">
                        <span class="recommend-price">¥<strong class="recommend-price-num">{{item.price.actPrice}}</strong></span>
                        <span class="recommend-count">{{item.remind.soldCount}}件已售</span>
                    </p>
                </router-link>
            </li>
        </ul>
    </div>
</template>

<script>
import {getHomeRecommend} from 'api/recommend';
import MeLoading from 'components/loading';

export default {
    name:"Recommend",
    data(){
        return {
           recommends:[],
           curPage:1,
           totalPage:1
        }
    },
    components:{
        MeLoading
    },
    created(){
        this.getRecommends();        
    },
    methods:{
        getRecommends(){           
            if(this.curPage>this.totalPage) return Promise.reject(new Error('没有更多了'));

            return getHomeRecommend(this.curPage).then(data=>{
                return new Promise(resolve=>{
              
                    if(data){
                        console.log(data);
                        
                        this.curPage++;
                        this.totalPage=data.totalPage;

                        // concat合并数组内容，每次获取的数据都追加进来
                        this.recommends=this.recommends.concat(data.itemList);

                        this.$emit("loaded",this.recommends);//热门推荐区域加载完毕后触发消息
                        resolve();
                    }
                })
            });
        }
    }
}
</script>

<style lang="scss" scoped>

    .recommend{
        position:relative;
        100%;
        padding:10px 0;
        font-size:14px;
        text-align:center;
        background:#fff;

        &:before,
        &:after{
            content:"";
            display:block;
            position:absolute;
            top:14%;
            40%;
            height:1px;
            background:#ddd;
        }

        &:before{
            left:0;        
        }

        &:after{
            right:0;
        }
    }
    .recommend-list{
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap:wrap;
    }
    .recommend-title{
        margin-bottom:8px;
    }
    .recommend-item{
        49%;
        background:#fff;
        box-shadow:0 1px 1px 0 rgba(0,0,0,0.12);
        margin-bottom:8px;
    }
    .recommend-link{
        display:block;
    }
    .recommend-pic{
        position:relative;
        100%;
        padding-top:100%;// 可以实现高度与宽度一致
        margin-bottom:5px;
    }
    .recommend-img{
        100%;
        position:absolute;
        top:0;
        left:0;
        height:100%;
    }
    .recommend-name{
        height:40px;
        padding:0 5px;
        margin-bottom:8px;
        line-height:1.5;
        overflow: hidden;
        text-overflow: ellipsis;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        white-space: normal !important;
        word-wrap: break-word;
        text-align:left;

    }
    .recommend-oriPrice{
        padding:0 5px;
        margin-bottom:8px;
        color:#ccc;
        text-align:left;
    }
    .recommend-info{
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding:0 5px;
        margin-bottom:8px;
    }
    .recommend-price{
        color:#e61414;

        &-num{
            font-size:20px;
        }
    }
    .recommend-count{
        color:#999;
    }
    .loading-container{
        padding-top:80px;
    }
     
</style>

6、首页中使用recommend组件

src/pages/home/index.vue

<template>
    <div class="home">
        <scrollbar :data="recommends">
            <slider />
            <home-nav />
            <!-- 热门推荐加载完成后更新滚动条 -->
            <recommend @loaded="updateScroll" />
        </scrollbar>
        <!-- 该页面自己的子路由 -->
        <router-view></router-view>
    </div>

</template>

<script>
import Slider from 'components/slider';
import Scrollbar from 'components/scroll';
import HomeNav from './nav';
import Recommend from './recommend';

export default {
    name:"Home",
    components:{
        Slider,   
        Scrollbar,
        HomeNav,
        Recommend    
    },
    data(){
        return{
            recommends:[]
        }
    },
    methods:{
        updateScroll(recommends){
            this.recommends=recommends;
        }
    }
}
</script>

<style scoped>
    .home{
        100%;
        height:100%;
    }
</style>

7、修改scroll组件，在热门推荐加载之后更新滚动条

src/components/scroll/index.vue

<template>
    <swiper class="swiper" :options="swiperOption" ref="swiper">
    <swiper-slide>
        <!-- 所有内容放在插槽里 -->
        <slot></slot>
    </swiper-slide>
    <div class="swiper-scrollbar" slot="scrollbar"></div>
  </swiper>
</template>

<script>
  import { Swiper, SwiperSlide } from 'vue-awesome-swiper';
  import 'swiper/css/swiper.css';

  export default {
    name: 'Scrollbar',
    title: 'Scrollbar',
    components: {
      Swiper,
      SwiperSlide
    },
    data() {
      return {
        swiperOption: {
          scrollbar: {
            el: '.swiper-scrollbar',
            hide: true
          },
          direction:'vertical',
          slidesPerView:'auto',
          freeMode:true,
          setWrapperSize:true
        }
      }
    },
    props:{
      recommends:{
        type:[Array,Object],
        default(){
          return [];
        }
      }
    },
    watch:{//当recommends值发生改变时
      recommends(){
        this.$refs.swiper && this.$refs.swiper.$swiper.update();//更新滚动条长度
      }
    }
  }
</script>

<style lang="scss" scoped>
    .swiper-container{
        100%;
        height:100%;
        overflow:hidden;
    }
    .swiper-wrapper{
        height:auto;
    }
    .swiper-slide{
        height:auto;
    }
</style>

效果图