微信小程序实现滑动切换自定义页码的方法分析

var div = document.getElementById('id');
div.setAttribute("class", "className");

 <view class="bottomView" >
  <view class="bottom1" style="display:{{bottomHidden1}}" >
   <view class="pageCur">
   <text class="textPageCur textFont">{{index+1}}-5</text>    //index是因为上方采用了<block wx:for="{{itemInfor}}" >显示内容，index从0开始计数便是当前下标
   </view>
   <view class="buttomImg">
   <image clss="horImg" mode="top left" src="../img/horizontal.jpg"></image>
   </view>
  </view>
  <view class="bottom2" style="display:{{bottomHidden2}}">
   <view class="pageCur">
   <text class="textPageCur textFont" > {{index+1}}-5</text>
   </view>
   <view class="buttomImg">
    <image clss="horImg" mode="top left" src="../img/horizontal.jpg"></image>
   </view>
  </view>
  <view class="bottom3" style="display:{{bottomHidden3}}">
   <view class="pageCur">
   <text class="textPageCur textFont">{{index+1}}-5</text>
   </view>
   <view class="buttomImg">
    <image clss="horImg" mode="top left" src="../img/horizontal.jpg"></image>
   </view>
   </view>
  </view>

Page({
 data: {
 bottomHidden1:"block",
 bottomHidden2: "none" ,
 bottomHidden3: "none" ,
 },
 swiperChange:function(event){
 var currentView=event.detail.current;     //此处使用了swiper的bindchange事件带过来的参数current，这个参数从0开始计数，内容为当前页码
 var isHidden1 ="";
 var isHidden2 ="";
 var isHidden3 ="";
 switch (currentView) {
  case 1:
  isHidden1 = "none";
  isHidden2 = "block";
  isHidden3 = "none";
  break;
  case 2:
  isHidden1 = "none";
  isHidden2 = "none";
  isHidden3 = "block" ;
  break;
  case 0:
  isHidden1 = "block";
  isHidden2 = "none";
  isHidden3 = "none";;
  break;
 }
 this.setData({
  bottomHidden1:isHidden1,
  bottomHidden2: isHidden2,
  bottomHidden3: isHidden3
 });
 },