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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