Html的代码：

<div class="carousel_img"><div class="car_img" style="background:url(files/DocMatchImg_1.png) no-repeat;background-size:cover;background-position:center;"></div><div class="car_img" style="background:url(files/DocMatchImg_2.png) no-repeat;background-size:cover;background-position:center;"></div><div class="car_img" style="background:url(files/DocMatchImg_1.png) no-repeat;background-size:cover;background-position:center;"></div><div class="car_img" style="background:url(files/DocMatchImg_2.png) no-repeat;background-size:cover;background-position:center;"></div><div class="car_img" style="background:url(files/DocMatchImg_2.png) no-repeat;background-size:cover;background-position:center;"></div><div class="carousel_index"><div class="carousel_icon carousel_icon1"></div><div class="carousel_icon carousel_icon2"></div><div class="carousel_icon carousel_icon2"></div><div class="carousel_icon carousel_icon2"></div><div class="carousel_icon carousel_icon2"></div></div>
</div>

css代码：

.carousel_img{width:100%;position:relative;top:0;left:0;overflow:hidden;height:200px;}
.car_img{width:100%;height:200px;position:absolute;top:0;left:0;}
.carousel_index{position:absolute;top:180px;right:0;padding-right:24px;height:12px;}
.carousel_icon{width:12px;height:12px;float:left;}
.carousel_icon1{background:url(../image/DovmatchWhite.png) no-repeat;background-size:8px;background-position:center center;}
.carousel_icon2{background:url(../image/DovmatchGrey.png) no-repeat;background-size:8px;background-position:center center;}

jq代码：

$(document).ready(function(e) {var imgObj = document.getElementsByClassName("car_img");var imgLen = imgObj.length;var windowWidth = $(window).width();$(".car_img").bind("click",function(event){});int = setInterval(carouselImg,3000);for(var i=0;i<imgLen;i++){$(".car_img").eq(i).css({"top":"0","left":i*windowWidth});imgObj[i].addEventListener('touchstart',touchstart,false);imgObj[i].addEventListener('touchmove',touchmove,false);imgObj[i].addEventListener('touchend',touchend,false);}});function touchstart(event){event.preventDefault();if( event.targetTouches.length == 1 ){clearInterval(int);var touch = event.targetTouches[0];pressX = touch.pageX;}
}/**定义每次滑动的距离spanX*定义当前滑动的索引位置thisIndex，轮播图的个数imgLen*/
function touchmove(event){event.preventDefault();if( event.targetTouches.length == 1 ){var touch = event.targetTouches[0];var spanX = touch.pageX - pressX ,windowWidth = $(window).width();var $car_img = $(".car_img"),$this = $(this);var thisIndex = $this.index(),imgLen = $(".car_img").length;for(var i=0;i < imgLen;i++){$car_img.eq(i).css("left",windowWidth*(i-thisIndex)+spanX);}}
}function touchend(event){var $car_img = $(".car_img"),$this = $(this),$carousel_icon = $(".carousel_icon"),windowWidth = $(window).width();var thisIndex = $this.index(),imgLen = $(".car_img").length;var thisLeft = parseInt($(this).css("left"));//向左滑动执行的方法if(thisLeft < -32 && thisIndex < imgLen){//当轮播图滑动最后一个位置时，当前轮播图位置不变if(thisIndex == imgLen-1){for(var i=0;i < imgLen;i++){$car_img.eq(i).animate({"left":windowWidth*(i-thisIndex)},300);}}//当轮播不在最后一个位置时，轮播图位置变化方法else{for(var i=0;i < imgLen;i++){$car_img.eq(i).animate({"left":windowWidth*(i-(thisIndex+1))},300);$carousel_icon.eq(i).addClass("carousel_icon2").removeClass("carousel_icon1");}$carousel_icon.eq(thisIndex+1).removeClass("carousel_icon2").addClass("carousel_icon1");}}//向右滑动执行的方法else if(thisLeft > 32 && thisIndex >= 0){//当轮播图在第一个位置时if( thisIndex == 0){for(var i=0;i < imgLen;i++){$car_img.eq(i).animate({"left":windowWidth*(i-thisIndex)},300);}}//轮播图不在第一个位置else{for(var i=0;i < imgLen;i++){$car_img.eq(i).animate({"left":windowWidth*(i-(thisIndex-1))},300);$carousel_icon.eq(i).addClass("carousel_icon2").removeClass("carousel_icon1");}$carousel_icon.eq(thisIndex-1).removeClass("carousel_icon2").addClass("carousel_icon1");}}//当滑动距离在大于-32px并且小于32px时，当前轮播图位置不变else{for(var i=0;i < imgLen;i++){$car_img.eq(i).animate({"left":windowWidth*(i-thisIndex)},100);}}int = setInterval(carouselImg,3000);
}function carouselImg(){var $car_img = $(".car_img"),$carousel_icon = $(".carousel_icon"),windowWidth = $(window).width();var imgLen = $car_img.length,imgZeroIndex = 0;for(var i=0;i<imgLen;i++){var everyImgLeft = parseInt($car_img.eq(i).css("left"));if(everyImgLeft == 0){imgZeroIndex = i;break;}    } if(imgZeroIndex == imgLen-1){for(var i=0;i<imgLen;i++){$car_img.eq(i).animate({"left":windowWidth*i},300);$carousel_icon.eq(i).removeClass("carousel_icon1").addClass("carousel_icon2");}$carousel_icon.eq(0).removeClass("carousel_icon2").addClass("carousel_icon1");}else{for(var i=0;i<imgLen;i++){$car_img.eq(i).animate({"left":windowWidth*(i-(imgZeroIndex+1))},300);$carousel_icon.eq(i).removeClass("carousel_icon1").addClass("carousel_icon2");}$carousel_icon.eq(imgZeroIndex+1).removeClass("carousel_icon2").addClass("carousel_icon1");}
}

代码有缺陷，其中touchstart函数中点击开始的X坐标pressX不用全局变量该怎么表示？还有int这样的一个全局变量，没有解决好，有大神可以指正下。

展示效果图