vue2.0行動端做出下拉式刷新與上拉載入功能

這次帶給大家vue2.0行動端做出下拉刷新與上拉加載功能，vue2.0移動端做出下拉刷新與上拉加載功能的注意事項有哪些，下面就是實戰案例，一起來看一下。

直接上程式碼，不懂的多看幾遍，下面我換會告訴大家如何使用。

<template>
 <p>
  <section>
   <header>
    <slot>
      <span>下拉更新</span>
      <span>松开更新</span>
      <span>更新中</span>
    </slot>
   </header>
   <slot></slot>
   <footer>
    <slot>
     <span>加载中……</span>
    </slot>
   </footer>
  </section>
 </p>
</template>
<script>
export default {
 props: {
  offset: {
   type: Number,
   default: 40
  },
  enableInfinite: {
   type: Boolean,
   default: true
  },
  enableRefresh: {
   type: Boolean,
   default: true
  },
  onRefresh: {
   type: Function,
   default: undefined,
   required: false
  },
  onInfinite: {
   type: Function,
   default: undefined,
   require: false
  }
 },
 data() {
  return {
   top: 0,
   state: 0,
   startY: 0,
   touching: false,
   infiniteLoading: false
  }
 },
 methods: {
  touchStart(e) {
   this.startY = e.targetTouches[0].pageY
   this.startScroll = this.$el.scrollTop || 0
   this.touching = true
  },
  touchMove(e) {
   if (!this.enableRefresh || this.$el.scrollTop > 0 || !this.touching) {
    return
   }
   let diff = e.targetTouches[0].pageY - this.startY - this.startScroll
   if (diff > 0) e.preventDefault()
   this.top = Math.pow(diff, 0.8) + (this.state === 2 ? this.offset : 0)
   if (this.state === 2) { // in refreshing
    return
   }
   if (this.top >= this.offset) {
    this.state = 1
   } else {
    this.state = 0
   }
  },
  touchEnd(e) {
   if (!this.enableRefresh) return
   this.touching = false
   if (this.state === 2) { // in refreshing
    this.state = 2
    this.top = this.offset
    return
   }
   if (this.top >= this.offset) { // do refresh
    this.refresh()
   } else { // cancel refresh
    this.state = 0
    this.top = 0
   }
  },
  refresh() {
   this.state = 2
   this.top = this.offset
   this.onRefresh(this.refreshDone)
  },
  refreshDone() {
   this.state = 0
   this.top = 0
  },
  infinite() {
   this.infiniteLoading = true
   this.onInfinite(this.infiniteDone)
  },
  infiniteDone() {
   this.infiniteLoading = false
  },
  onScroll(e) {
   if (!this.enableInfinite || this.infiniteLoading) {
    return
   }
   let outerHeight = this.$el.clientHeight
   let innerHeight = this.$el.querySelector(&#39;.inner&#39;).clientHeight
   let scrollTop = this.$el.scrollTop
   let ptrHeight = this.onRefresh ? this.$el.querySelector(&#39;.pull-refresh&#39;).clientHeight : 0
   let infiniteHeight = this.$el.querySelector(&#39;.load-more&#39;).clientHeight
   let bottom = innerHeight - outerHeight - scrollTop - ptrHeight
   if (bottom < infiniteHeight) this.infinite()
  }
 }
}
</script>
<style>
.yo-scroll {
 position: absolute;
 top: 2.5rem;
 right: 0;
 bottom: 0;
 left: 0;
 overflow: auto;
 -webkit-overflow-scrolling: touch;
 background-color: #ddd
}
.yo-scroll .inner {
 position: absolute;
 top: -2rem;
 width: 100%;
 transition-duration: 300ms;
}
.yo-scroll .pull-refresh {
 position: relative;
 left: 0;
 top: 0;
 width: 100%;
 height: 2rem;
 display: flex;
 align-items: center;
 justify-content: center;
}
.yo-scroll.touch .inner {
 transition-duration: 0ms;
}
.yo-scroll.down .down-tip {
 display: block;
}
.yo-scroll.up .up-tip {
 display: block;
}
.yo-scroll.refresh .refresh-tip {
 display: block;
}
.yo-scroll .down-tip,
.yo-scroll .refresh-tip,
.yo-scroll .up-tip {
 display: none;
}
.yo-scroll .load-more {
 height: 3rem;
 display: flex;
 align-items: center;
 justify-content: center;
} 
</style>

把上面元件拷貝一下，存成後綴是.vue的元件放到你的component下，  然後引入到頁面, 下面是我引用的demo

上程式碼：裡面有註解哦，有問題給我留言！

<template>
 <p>
    <v-scroll>
    <ul>
     <li>{{item.name}}</li>
     <li>{{item.name}}</li>
    </ul>
  </v-scroll>
 </p>
</template>
<script>
import Scroll from &#39;./y-scroll/scroll&#39;;
export default{
 data () {
  return {
   counter : 1, //默认已经显示出15条数据 count等于一是让从16条开始加载
   num : 15, // 一次显示多少条
   pageStart : 0, // 开始页数
   pageEnd : 0, // 结束页数
   listdata: [], // 下拉更新数据存放数组
   downdata: [] // 上拉更多的数据存放数组
  }
 },
 mounted : function(){
   this.getList();
 },
 methods: {
  getList(){
    let vm = this;
     vm.$http.get(&#39;https://api.github.com/repos/typecho-fans/plugins/contents/&#39;).then((response) => {
          vm.listdata = response.data.slice(0,15);
         }, (response) => {
          console.log(&#39;error&#39;);
        });
  },
  onRefresh(done) {
       this.getList();
    
       done() // call done
   
  },
  onInfinite(done) {
       let vm = this;
       vm.$http.get(&#39;https://api.github.com/repos/typecho-fans/plugins/contents/&#39;).then((response) => {
         vm.counter++;
         vm.pageEnd = vm.num * vm.counter;
         vm.pageStart = vm.pageEnd - vm.num;
         let arr = response.data;
           let i = vm.pageStart;
           let end = vm.pageEnd;
           for(; i<end; i++){
            let obj ={};
            obj["name"] = arr[i].name;
            vm.downdata.push(obj);
             if((i + 1) >= response.data.length){
             this.$el.querySelector(&#39;.load-more&#39;).style.display = &#39;none&#39;;
             return;
            }
            }
         done() // call done
          }, (response) => {
          console.log(&#39;error&#39;);
        });
      }
 },
 components : {
&#39;v-scroll&#39;: Scroll
 }
}
</script>

我相信看了本文案例你已經掌握了方法，更多精彩請關注php中文網其它相關文章！

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