JS实现移动端整屏滑动的实例代码

基本思路:

1)检测手指滑动方向:获取手指抬起时的位置,减去手指按下时的位置,得正即为向下滑动了

2)手指抬起后,向对应反向操作改变当前页的位置

具体代码如下:

html

<div id="wrap">
  <div id="page01" class="pages">第一屏</div>
  <div id="page02" class="pages">第二屏</div>
  <div id="page03" class="pages">第三屏</div>
  <div id="page04" class="pages">第四屏</div>
</div>
<div id="dots">
  <span class="now"></span><span class=""></span><span class=""></span><span class=""></span>
</div>

css

*{
      margin:0;
      padding:0;
    }
    body{
      overflow: hidden;
    }
    #wrap > div{
      width: 10rem;
      position: absolute;
      left: 0;
      top: 0;
      background: #fff;
      transition: all 0.3s ease;
    }
    #dots{
      position: fixed;
      right: 5px;
      top: 40%;
      z-index: 9;
    }
    #dots span{
      display: block;
      height: 0.2rem;
      width: 0.2rem;
      border: 1px solid #000;
      border-radius: 50%;
      margin-bottom: 3px;
    }
    #dots .now{
      background: #555;
    }

js分为两块

第一,设置html标签的font-size,以便设置rem的基数 (放在页面头部)

document.getElementsByTagName("html")[0].style.fontSize = window.innerWidth/10 + "px";

第二,具体的滑动操作代码

 window.onload = function(){
      var oDiv = document.getElementById("wrap");
      var aPages = oDiv.getElementsByClassName("pages");
      var aDots = document.getElementById("dots").getElementsByTagName("span");
      var winH = window.innerHeight;
      var tTime = 1;
      //设置每页的高度和zindex值
      for(var i=0; i<aPages.length; i++){
        aPages[i].style.height = winH + "px";
        aPages[i].style.zIndex = 1;
      }
      aPages[0].style.zIndex = 3;
      aPages[1].style.zIndex = 2;
      oDiv.style.height = winH + "px";
      //手指拖动事件(去除默认动作)
      document.addEventListener("touchmove",function(e){
        e.preventDefault();
      });
      var YStart = 0;
      var iNow = 0;
      //手指按下
      oDiv.addEventListener("touchstart",function(e){
        YStart = e.changedTouches[0].clientY;
      });
      //手指移动
      oDiv.addEventListener("touchmove",function(e){
        disY = e.changedTouches[0].clientY-YStart; //向下滑正,向上滑负
      });
      //手指离开
      oDiv.addEventListener("touchend",function(e){
        disY = e.changedTouches[0].clientY-YStart; //向下滑正,向上滑负
        if(Math.abs(disY)>winH/20){ //只有当滑动距离大于了一定值得时候,才执行切换
          if(disY<0){
            iNow++;
            if(iNow>=aDots.length){
              iNow = 0;
            }
            aPages[0].style.transform = "translateY("+ -winH +"px)";
            doSlide();
          }else{
            iNow--;
            if(iNow<0){
              iNow = aDots.length-1;
            }
            aPages[0].style.transform = "translateY("+ winH +"px)";
            doSlide("up");
          }
        }
      });
      function doSlide(upflag){
        for(var i=0;i<aDots.length;i++){
          aDots[i].className = "";
        }
        aDots[iNow].className = "now";
        if(upflag){
            //向上滑
            aPages[3].style.zIndex = 2;
            aPages[1].style.zIndex = 1;
            oDiv.insertBefore(aPages[3],aPages[1]);
            setTimeout(function(){
              aPages[1].style.transform = "translateY(0px)";
              aPages[1].style.zIndex = 2;
              aPages[0].style.zIndex = 3;
            },300)
        }else{
          setTimeout(function(){
            aPages[0].style.transform = "translateY(0px)";
            aPages[0].style.zIndex = 1;
            aPages[1].style.zIndex = 3;
            aPages[2].style.zIndex = 2;
            oDiv.appendChild(aPages[0]);
          },300)
        }
      }
    }
      

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