這次帶給大家JS做出行動端觸控輪播效果,JS做出行動端觸控輪播效果的注意事項有哪些,以下就是實戰案例,一起來看一下。
以下是行動端手指滑動輪播圖的完整程式碼。
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <style> *{margin:0;padding:0;} li{list-style:none;} .lb{width:320px;height:130px;position:relative;margin:20px auto;overflow: hidden;} .lb .lb_img{width:2240px;height:130px;position:absolute;left:-320px;} .lb .lb_img img{width:320px;height:130px;float:left;display:block;} .lb ul{width:35px;height:4px;position:absolute;bottom:10px;left:50%;margin-left:-15px;} .lb ul li{width:4px;height:4px;border-radius:2px;border:0.25px solid #fff;margin-left:2.5px;background:#666;float:left;cursor:pointer;} .lb ul .active{background:#fff;} .lb ul li:hover{background:#fff;} </style> </head> <body> <p class="lb"> <p class="lb_img"> <img src="img/4.jpg"> <img src="img/0.jpg"> <img src="img/1.jpg"> <img src="img/2.jpg"> <img src="img/3.jpg"> <img src="img/4.jpg"> <img src="img/0.jpg"> </p> <ul> <li class="active"></li> <li></li> <li></li> <li></li> <li></li> </ul> </p> <script> var lb = document.querySelector(".lb"); var lb_img = document.querySelector(".lb .lb_img"); var img = document.querySelectorAll(".lb .lb_img img") var lis = document.querySelectorAll(".lb ul li"); var i=2; // 初始化手指坐标点 var startPoint = 0; var startEle = 0; //手指按下 lb.addEventListener("touchstart",function(e){ startPoint = e.changedTouches[0].pageX; startEle = lb_img.offsetLeft; clearInterval(Time) }); //手指滑动 lb.addEventListener("touchmove",function(e){ var currPoint = e.changedTouches[0].pageX; var disX = currPoint - startPoint; var left = startEle + disX; lb_img.style.left = left + "px"; }); //当手指抬起的时候, lb.addEventListener("touchend",function(e){ var currPoint = e.changedTouches[0].pageX; var disX = - (currPoint - startPoint); var left = startEle + disX; if(disX > 150){ i++; for(var q=0;q<lis.length;q++){ lis[q].className = ''; } if(i == 7){ i=2; } lis[i-2].className= "active" ; lb_img.style.left = -320*(Math.round(disX/320)+i+1)+ 'px'; }else{ lb_img.style.left = -320*(i-1) + "px"; } if(disX < -150){ i--; for(var q=0;q<lis.length;q++){ lis[q].className = ''; } if(i == 1){ i=6; } lis[i-2].className= "active" ; lb_img.style.left = -320*(Math.round(-disX/320)+i-2) + 'px'; }else{ lb_img.style.left = -320*(i-1) + "px"; } Time=setInterval(autoplay,2000); }) //设置定时器 Time=setInterval(autoplay,2000); function autoplay(){ i++; for(var q=0;q<lis.length;q++){ lis[q].className = ''; } if(i == 7){ i=2; } lis[i-2].className= "active" ; for(var a=0; a<320;a++){ setTimeout(function(){ var left = lb_img.style.left ? lb_img.style.left : "-320px"; left = parseInt(left)-1; if(left<-1920){ left=-321; } lb_img.style.left = left + "px"; },a); } } </script> </body> </html>
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