Vue webAPP首页开发（三）

接上篇 https://www.cnblogs.com/chenyingying0/p/12623653.html

 

下拉刷新

下拉刷新--变化提示文字

 

base/scroll/index.vue

<template>
    <!-- wiper会实例化构造函数，生成swiper实例 -->
    <!-- ref="swiper"能够获取到这个swiper实例 -->
    <swiper :options="swiperOption" ref='swiper'>
        <div class="mine-scroll-pull-down" v-if="pullDown">
            <!-- ref="pullDownLoading" -- 获取下拉的loading -->
            <me-loading :text="pullDownText" inline ref="pullDownLoading" />
        </div>
        <swiper-slide>
            <slot></slot>
        </swiper-slide>
        <div class="swiper-scrollbar" v-if="scrollbar" slot="scrollbar"></div>
    </swiper>
</template>

<script>
// 组件首字母大写，否则会报错
import {Swiper,SwiperSlide} from 'vue-awesome-swiper';
import MeLoading from 'base/loading';

import {
    PULL_DOWN_HEIGHT,
    PULL_DOWN_TEXT_INIT,
    PULL_DOWN_TEXT_START,
    PULL_DOWN_TEXT_ING,
    PULL_DOWN_TEXT_END
} from './config';

export default {
    name:"MeScroll",
    components:{
        Swiper,
        SwiperSlide,
        MeLoading
    },
    props:{//过滤器
       scrollbar:{
           type:Boolean,
           default:true
       },
       data:{//热门推荐加载完成后传递过来的recommends数据
           type:[Array,Object]         
       },
       pullDown:{
           type:Boolean,
           default:false
       }
    },
    data(){
        return {
            pullDownText:PULL_DOWN_TEXT_INIT,//设置初始化文字
            swiperOption:{
                direction:'vertical',//垂直方向
                slidesPerView:'auto',//一次显示几张
                freeMode:true,//任意滑动多少距离
                setWrapperSize:true,//根据内容设置容器尺寸
                scrollbar:{
                    el:this.scrollbar?'.swiper-scrollbar':null,
                    hide:true //滚动条自动隐藏
                },
                on:{
                    //swiper配置时会触发sliderMove方法，这里调用时执行自定义的scroll方法
                    sliderMove:this.scroll
                }

            }
        }
    },
    methods:{
        update(){//不知道怎么写就去swiper官网查api
            console.log(this.$refs.swiper);//打印swiper实例

            this.$refs.swiper && this.$refs.swiper.$swiper.update();//调用swiper.update()更新滚动条
        },
        scroll(){
            const swiper=this.$refs.swiper.$swiper;
            console.log(swiper.translate);//打印出滚动条滚过的距离
            if(swiper.translate>0){//下拉
                if(!this.pullDown){//如果不需要下拉刷新
                    return;
                }
                if(swiper.translate>PULL_DOWN_HEIGHT){
                    this.$refs.pullDownLoading.setText(PULL_DOWN_TEXT_START);
                }else{
                    this.$refs.pullDownLoading.setText(PULL_DOWN_TEXT_INIT);
                }
            }
        }
    },
    watch:{//检测数据变化的事件
        data(){
            this.update();//data数据变化时执行update函数
        }
    }
}
</script>

<style lang="scss" scoped>
    @import '~assets/scss/mixins';

    .swiper-container{
        width:100%;
        height:100%;
        overflow:hidden;

        & .swiper-slide{
            height:auto;
        }  
    }
    //默认是不显示的
    .mine-scroll-pull-down{
        position:absolute;
        left:0;
        bottom:100%;
        width:100%;
        height:80px;
    }
     
</style>

 

base/loading/index.vue

<template>
    <div class="mine-loading" :class="{'me-loading-inline':inline}">
        <span class="mine-loading-indicator" v-if="indicator==='on'" >
            <img src="./loading.gif" alt="">
        </span>
        <span class="mine-loading-text" v-if="loadingText">{{loadingText}}</span>
    </div>
</template>

<script>
export default {
   name:"MeLoading",
   props:{//过滤器
       indicator:{
           type:String,
           default:'on',
           validator(value){
               return ['on','off'].indexOf(value)>-1;
           }
       },
       text:{
           type:String,
           default:'加载中...'
       },
        inline:{
            type:Boolean,
            default:false
        }
   },
   data(){
       return{
           loadingText:this.text
       }
   },
   methods:{
       setText(text){
           this.loadingText=text;
       }
   },
   watch:{
       text(text){
           this.loadingText=text;
       }
   }
}
</script>

<style lang="scss" scoped>
    @import '~assets/scss/mixins';

    .mine-loading{
        width:100%;
        height:100%;
        @include flex-center(column);

        //图文左右排列时
        &.me-loading-inline{
            flex-direction: row;
           
            .mine-loading-indicator ~ .mine-loading-text{
                margin-top:0px;
                margin-left:7px;
            }
        }

        .mine-loading-indicator{

        }

        // 存在.mine-loading-indicator和.mine-loading-text时
        .mine-loading-indicator ~ .mine-loading-text{
            margin-top:7px;
        }
    }
</style>

 

base/scroll/config.js

export const PULL_DOWN_HEIGHT=100;
export const PULL_DOWN_TEXT_INIT='再拉，再拉就刷新给你看';
export const PULL_DOWN_TEXT_START='够了啦，松开人家嘛';
export const PULL_DOWN_TEXT_ING='刷的好累呀，喵~';
export const PULL_DOWN_TEXT_END='刷新完啦';

 

pages/home/index.vue

<template>
    <div class="home">
        <header class="g-header-container">
            <!-- 没有内容自闭合即可-->
            <home-header/>
        </header> 
        <!-- 滚动条接收到数据后开始更新 -->
        <!-- pullDown是布尔值，可以使用简写直接传入，不加冒号 -->
        <me-scroll :data="recommends" pullDown>
            <home-slider />
            <home-nav />
            <!-- 接收热门推荐加载完毕的消息 -->
            <home-recommend @loaded="getRecommends" />
        </me-scroll>
        <div class="g-backup-container"></div>
        <!-- 当前页面存在二级页面时需要使用router-view -->
        <router-view></router-view>
    </div>
</template>

<script>
import MeScroll from 'base/scroll';
import HomeHeader from './header';
import HomeSlider from './slider';
import HomeNav from './nav';
import HomeRecommend from './recommend';


export default {
    name:"Home",
    components:{
        HomeHeader,
        HomeSlider,
        MeScroll,
        HomeNav,
        HomeRecommend
    },
    data(){
        return{
            recommends:[]
        }
    },
    methods:{
        getRecommends(recommends){
            this.recommends=recommends;
        },
        updateScroll(){

        }
    }
}
</script>

<style lang="scss" scoped>
    // 引入前面需要加波浪线，否则会报错
    @import "~assets/scss/mixins";
    .home{
        overflow:hidden;
        width:100%;
        height:100%;
        background:$bgc-theme;
    }

</style>

 

效果图

 

下拉刷新--松手刷新

修改base/scroll/index.vue

<template>
    <!-- wiper会实例化构造函数，生成swiper实例 -->
    <!-- ref="swiper"能够获取到这个swiper实例 -->
    <swiper :options="swiperOption" ref='swiper'>
        <div class="mine-scroll-pull-down" v-if="pullDown">
            <!-- ref="pullDownLoading" -- 获取下拉的loading -->
            <me-loading :text="pullDownText" inline ref="pullDownLoading" />
        </div>
        <swiper-slide>
            <slot></slot>
        </swiper-slide>
        <div class="swiper-scrollbar" v-if="scrollbar" slot="scrollbar"></div>
    </swiper>
</template>

<script>
// 组件首字母大写，否则会报错
import {Swiper,SwiperSlide} from 'vue-awesome-swiper';
import MeLoading from 'base/loading';

import {
    PULL_DOWN_HEIGHT,
    PULL_DOWN_TEXT_INIT,
    PULL_DOWN_TEXT_START,
    PULL_DOWN_TEXT_ING,
    PULL_DOWN_TEXT_END
} from './config';

export default {
    name:"MeScroll",
    components:{
        Swiper,
        SwiperSlide,
        MeLoading
    },
    props:{//过滤器
       scrollbar:{
           type:Boolean,
           default:true
       },
       data:{//热门推荐加载完成后传递过来的recommends数据
           type:[Array,Object]         
       },
       pullDown:{
           type:Boolean,
           default:false
       }
    },
    data(){
        return {
            pulling:false,//是否正在下拉
            pullDownText:PULL_DOWN_TEXT_INIT,//设置初始化文字
            swiperOption:{
                direction:'vertical',//垂直方向
                slidesPerView:'auto',//一次显示几张
                freeMode:true,//任意滑动多少距离
                setWrapperSize:true,//根据内容设置容器尺寸
                scrollbar:{
                    el:this.scrollbar?'.swiper-scrollbar':null,
                    hide:true //滚动条自动隐藏
                },
                on:{
                    //swiper配置时会触发sliderMove方法，这里调用时执行自定义的scroll方法
                    sliderMove:this.scroll,
                    touchEnd:this.touchEnd//touchEnd是swiper提供的滚动结束的函数，this.touchEnd是我们自己写的函数
                }

            }
        }
    },
    methods:{
        update(){//不知道怎么写就去swiper官网查api
            //console.log(this.$refs.swiper);//打印swiper实例

            this.$refs.swiper && this.$refs.swiper.$swiper.update();//调用swiper.update()更新滚动条
        },
        scroll(){
            const swiper=this.$refs.swiper.$swiper;

            //如果正在下拉中，不会再次执行
            if(this.pulling) return;

            console.log(swiper.translate);//打印出滚动条滚过的距离
            if(swiper.translate>0){//下拉
                if(!this.pullDown){//如果不需要下拉刷新
                    return;
                }
                if(swiper.translate>PULL_DOWN_HEIGHT){
                    this.$refs.pullDownLoading.setText(PULL_DOWN_TEXT_START);
                }else{
                    this.$refs.pullDownLoading.setText(PULL_DOWN_TEXT_INIT);
                }
            }
        },
        touchEnd(){
            const swiper=this.$refs.swiper.$swiper;

            //如果正在下拉中，不会再次执行
            if(this.pulling) return;           

            if(swiper.translate>PULL_DOWN_HEIGHT){//如果距离大于设定的距离
                if(!this.pullDown){//如果不需要下拉刷新
                    return;
                }
                this.pulling=true;

                swiper.allowTouchMove=false;//禁止触摸
                swiper.setTransition(swiper.params.speed);//设置初始速度
                swiper.setTranslate(PULL_DOWN_HEIGHT);//移动到设定的位置（拖动过度时回到设置的位置）
                swiper.params.virtualTranslate=true;//定住不给回弹
                this.$refs.pullDownLoading.setText(PULL_DOWN_TEXT_ING);//设置正在刷新中的文字
                this.$emit("pull-down",this.pullDownEnd);//触发消息，传递结束下拉的函数
            }
        },
        pullDownEnd(){
            const swiper=this.$refs.swiper.$swiper;

            this.pulling=false;

            this.$refs.pullDownLoading.setText(PULL_DOWN_TEXT_END);//设置加载结束后的文字
            swiper.allowTouchMove=true;//可以触摸
            swiper.setTransition(swiper.params.speed);//设置初始速度           
            swiper.params.virtualTranslate=false;//可以回弹
            swiper.setTranslate(0);//移动到最初的位置
        }
    },
    watch:{//检测数据变化的事件
        data(){
            this.update();//data数据变化时执行update函数
        }
    }
}
</script>

<style lang="scss" scoped>
    @import '~assets/scss/mixins';

    .swiper-container{
        width:100%;
        height:100%;
        overflow:hidden;

        & .swiper-slide{
            height:auto;
        }  
    }
    //默认是不显示的
    .mine-scroll-pull-down{
        position:absolute;
        left:0;
        bottom:100%;
        width:100%;
        height:80px;
    }
     
</style>

 

修改pages/home/index.vue

<template>
    <div class="home">
        <header class="g-header-container">
            <!-- 没有内容自闭合即可-->
            <home-header/>
        </header> 
        <!-- 滚动条接收到数据后开始更新 -->
        <!-- pullDown是布尔值，可以使用简写直接传入，不加冒号 -->
        <!-- 接收到pull-down消息后，触发pullToRefresh方法 -->
        <me-scroll :data="recommends" pullDown @pull-down="pullToRefresh">
            <home-slider />
            <home-nav />
            <!-- 接收热门推荐加载完毕的消息 -->
            <home-recommend @loaded="getRecommends" />
        </me-scroll>
        <div class="g-backup-container"></div>
        <!-- 当前页面存在二级页面时需要使用router-view -->
        <router-view></router-view>
    </div>
</template>

<script>
import MeScroll from 'base/scroll';
import HomeHeader from './header';
import HomeSlider from './slider';
import HomeNav from './nav';
import HomeRecommend from './recommend';


export default {
    name:"Home",
    components:{
        HomeHeader,
        HomeSlider,
        MeScroll,
        HomeNav,
        HomeRecommend
    },
    data(){
        return{
            recommends:[]
        }
    },
    methods:{
        getRecommends(recommends){
            this.recommends=recommends;
        },
        updateScroll(){

        },
        pullToRefresh(end){
            setTimeout(()=>{
                console.log("下拉刷新");
                end();
            },1000);
        }
    }
}
</script>

<style lang="scss" scoped>
    // 引入前面需要加波浪线，否则会报错
    @import "~assets/scss/mixins";
    .home{
        overflow:hidden;
        width:100%;
        height:100%;
        background:$bgc-theme;
    }

</style>

 

效果图

 

更新幻灯片

真正实现通过下拉刷新，更新幻灯片

修改src/api/home.js

import axios from 'axios';
import {SUCC_CODE,TIMEOUT,HOME_RECOMMEND_PAGE_SIZE,JSONP_OPTIONS} from './config';
import jsonp from 'assets/js/jsonp';

// shuffle打乱数组顺序的方法
const shuffle=(arr)=>{
    const arrLength=arr.length;
    let i=arrLength;
    let rndNum;

    while(i--){
        //如果当前索引不等于随机数索引，则交换这两个索引的位置
        if(i!==(rndNum=Math.floor(Math.random()*arrLength))){
            //这是一种新的交换写法 ES6解构
            [arr[i],arr[rndNum]]=[arr[rndNum],arr[i]];
        }
    }
    return arr;
}

//获取幻灯片数据 ajax
export const getHomeSliders=()=>{

    //演示超时错误
    return axios.get('http://www.imooc.com/api/home/slider',{
        timeout:TIMEOUT
    }).then(res=>{
        //console.log(res);
        if(res.data.code===SUCC_CODE){

            //这段代码的作用主要是演示下拉刷新的效果
            //每次刷新会加载出不同数量，不同顺序的轮播图
            let sliders=res.data.slider;
            const slider=[sliders[Math.floor(Math.random()*sliders.length)]];//slider是从sliders中随机取出一张图片，并包装成数组
            sliders=shuffle(sliders.filter(()=>Math.random()>=0.5));//50%的概率，真就返回，假就剔除
            if(sliders.length===0){
                sliders=slider;//如果不幸一张都没有，就把之前随机的那张赋值给sliders
            }
            return sliders;

            //return res.data.slider;
        }

        throw new Error('没有成功获取到数据');
    }).catch(err=>{
        console.log(err);
        //错误处理
        return [{       
            linkUrl:'www.baidu.com',
            picUrl:require('assets/img/404.png')
        }]
    }).then(data=>{//获取轮播图数据后，延迟一秒再显示
        return new Promise(resolve=>{
            setTimeout(()=>{
                resolve(data);
            },1000);
        })
    });
}

//获取热门推荐数据
export const getHomeRecommend=(page=1,psize=HOME_RECOMMEND_PAGE_SIZE)=>{
    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,JSONP_OPTIONS).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);
        }
        
    }).then(res=>{
        //延迟一秒返回数据
        return new Promise(resolve=>{
            setTimeout(()=>{
                resolve(res);
            },1000);
        })
    })
    
}

pages/home/slider.vue

<template>
    <div class="slider-wrapper">
        <!-- sliders没加载时显示loading -->
        <Meloading v-if="!sliders.length"></Meloading>
        <!-- 分开传才能分开校验，因此不直接传入对象 -->
        <MeSlider 
            :data="sliders"
            :direction="direction"
            :loop="loop"
            :interval="interval"
            :pagination="pagination"
            v-else
        >
            <swiper-slide v-for="(item,index) in sliders" :key="index">
                <a :href="item.linkUrl" class="slider-link">
                    <img :src="item.picUrl" class="slider-img">
                </a>
            </swiper-slide>
        </MeSlider>
    </div>
</template>

<script>
import MeSlider from 'base/slider';
import { SwiperSlide } from 'vue-awesome-swiper';
import { sliderOptions } from './config';
import { getHomeSliders } from 'api/home';
import Meloading from 'base/loading';

export default {
   name:"HomeSlider",
   components:{
       MeSlider,
       SwiperSlide,
       Meloading
   },
    data(){
        return{
            direction:sliderOptions.direction,
            loop:sliderOptions.loop,
            interval:sliderOptions.interval,
            pagination:sliderOptions.pagination,
            sliders:[],//这是从服务器读取
        }
    },
    created(){
        //一般在created里获取远程数据
        this.getSliders();      
    },
    methods:{
        //api
        update(){
            return this.getSliders();
        },
        getSliders(){
            return getHomeSliders().then(data=>{
                //console.log(data);
                this.sliders=data;
            });
        }
    }
}
</script>

<style lang="scss" scoped>
    // 引入前面需要加波浪线，否则会报错
    @import "~assets/scss/mixins";
    .slider-wrapper{
        width:100%;
        height:183px;
    }
    .slider-link{
        display:block;
    }
    .slider-link,
    .slider-img{
        width:100%;
        height:100%;
    }
    
</style>

pages/home/index.vue

<template>
    <div class="home">
        <header class="g-header-container">
            <!-- 没有内容自闭合即可-->
            <home-header/>
        </header> 
        <!-- 滚动条接收到数据后开始更新 -->
        <!-- pullDown是布尔值，可以使用简写直接传入，不加冒号 -->
        <!-- 接收到pull-down消息后，触发pullToRefresh方法 -->
        <me-scroll :data="recommends" pullDown @pull-down="pullToRefresh">
            <home-slider ref="slider" />
            <home-nav />
            <!-- 接收热门推荐加载完毕的消息 -->
            <home-recommend @loaded="getRecommends" />
        </me-scroll>
        <div class="g-backup-container"></div>
        <!-- 当前页面存在二级页面时需要使用router-view -->
        <router-view></router-view>
    </div>
</template>

<script>
import MeScroll from 'base/scroll';
import HomeHeader from './header';
import HomeSlider from './slider';
import HomeNav from './nav';
import HomeRecommend from './recommend';


export default {
    name:"Home",
    components:{
        HomeHeader,
        HomeSlider,
        MeScroll,
        HomeNav,
        HomeRecommend
    },
    data(){
        return{
            recommends:[]
        }
    },
    methods:{
        getRecommends(recommends){
            this.recommends=recommends;
        },
        updateScroll(){

        },
        pullToRefresh(end){
            this.$refs.slider.update().then(end);
        }
    }
}
</script>

<style lang="scss" scoped>
    // 引入前面需要加波浪线，否则会报错
    @import "~assets/scss/mixins";
    .home{
        overflow:hidden;
        width:100%;
        height:100%;
        background:$bgc-theme;
    }

</style>

base/slider/index.vue

<template>
    <div class="mine-slider">
        <!-- 动态的属性前面加冒号 -->
        <swiper :options="swiperOption" class="swiper-container" :key="keyId">
            <slot></slot>
            <div class="swiper-pagination" v-if="pagination" slot="pagination"></div>
        </swiper>
    </div>
</template>

<script>
import { Swiper } from 'vue-awesome-swiper';

export default {
    name:"MeSlider",
    components: {
        Swiper
    },
    props:{
        direction:{
            type:String,
            default:'horizontal',
            validator(value){
                // 返回true则验证通过
                return [
                    'horizontal',
                    'vertical'
                ].indexOf(value)>-1;
            }
        },
        interval:{//自动轮播
            type:Number,
            default:3000,
            validator(value){
                return value>=0;
            }
        },
        loop:{//无缝滚动
            type:Boolean,
            default:true
        },
        pagination:{//分液器
            type:Boolean,
            default:true
        },
        data:{
            type:Array,
            default(){
                return [];
            }
        }
    },
    data(){
        return{
            keyId:Math.random(),
        }
    },
    watch:{
        data(newData){
            if(newData.length===0) return;
            this.swiperOption.loop=newData.length<=1?false:this.loop;//每次刷新后重新判断是否需要滚动
            this.keyId=Math.random();
        }
    },
    created(){
        this.init();
    },
    methods:{
        init(){
            this.swiperOption={
                watchOverflow:true,//只有一张图片时不设置滚动效果
                direction:this.direction,//滚动方向
                autoplay:this.interval?{
                    delay:this.interval,
                    disableOnInteraction:false//手指滑动时是否停止自动轮播
                }:false,
                slidesPerView:1,//同时显示几张图片
                loop:this.data.length<=1?false:this.loop,//是否开启无缝滚动，1张图片不需要滚动
                pagination:{//分页器
                    el:this.pagination?'.swiper-pagination':null
                }

            }
        }
    }
}
</script>

<style lang="scss" scoped>
    @import '~assets/scss/mixins';
    .swiper-container{
        width:100%;
        height:100%;
    }
</style>

效果图

来源：https://www.cnblogs.com/chenyingying0/p/12635080.html