js轮播图的插件化封装
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2022-05-14 11:41:32
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现在的网站经常会有一些图片轮播效果,网上也有很多各式各样的图片轮播插件,什么样的效果都有,这里分享一个我自己写的图片轮播效果
这个Lightbox有一个窗口容器,容器里面有一个长的容器,横向包住了所有图片,通过改变他的margin-left来实现左右效果的。
图片下方有图片个数对应的黑方块,点击黑方块也可以跳到对应的图片上去;
这个插件的最大的特点是可以根据里面的图片个数来实现切换,而且当滑到最后一张图片的时候时,再次点击右侧的按钮,右边回出现第一张图片,这样实现了循环播放。
图片的样式和按钮的样式我没有来得及调试,大家可以按照自己想要的效果来更改css
具体代码如下:
~function(){function AutoBanner(curEleId,ajaxURL,interval){//把之前存储获取元素的变量都作为当前实例的私有属性this.banner = document.getElementById(curEleId);this.bannerInner = utils.firstChild(this.banner);this.bannerTip = utils.children(this.banner,"ul")[0];this.bannerLink = utils.children(this.banner,'a');this.bannerLeft = this.bannerLink[0];this.bannerRight = this.bannerLink[1];this.divList = this.bannerInner.getElementsByTagName('div');this.imgList = this.bannerInner.getElementsByTagName('img');this.oLis = this.bannerTip.getElementsByTagName('li');//之前的全局变量也应该变为自己的私有属性this.jsonData = null;this.interval = interval || 3000;this.autoTimer = null;this.step = 0;this.ajaxURL = ajaxURL;//返回当前实例return this.init(); } AutoBanner.prototype = { constructor:AutoBanner,//Ajax请求数据getData:function(){var _this = this;var xhr = new XMLHttpRequest; xhr.open("get",this.ajaxURL + "?_="+Math.random(),false); xhr.onreadystatechange = function(){if(xhr.readyState ===4 && /^2\d{2}$/.test(xhr.status)){ _this.jsonData = utils.formatJSON(xhr.responseText) } } xhr.send(null) },//实现数据绑定bindData:function(){var str = "",str2 = "";if(this.jsonData){for(var i = 0,len=this.jsonData.length;i<len;i++){var curData = this.jsonData[i]; str+='<div><img src="" alt="" trueImg="'+curData['img']+'"></div>'; i===0?str2+="<li class='bg'></li>":str2+="<li></li>"} }this.bannerInner.innerHTMl = str;this.bannerTip.innerHTML = str2; },//延迟加载lazyImg:function(){var _this = this;for(var i = 0,len = this.imgList.length;i<len;i++){~function(i){var curImg = _this.imgList[i];var oImg = new Image; oImg.src = curImg.getAttribute('trueImg'); oImg.onload = function(){ curImg.src = this.src; curImg.style.display = block;//只对第一张处理if(i===0){var curDiv = curImg.parentNode; curDiv.style.zIndex = 1; myAnimate(curDiv,{opacity:1},200); } oImg = null; } }(i) } },//自动轮播autoMove:function(){if(this.step === this.jsonData.length-1){this.step = -1}this.step++;this.setBanner(); },//切换效果和焦点对齐setBanner:function(){for(var i = 0,len = this.divList.length;i<len;i++){var curDiv = this.divList[i];if(i===this.step){ utils.css(curDiv,"zIndex",1)//2、让当前的透明度从0变为1,当动画结束,我们需要让其他的div的透明度的值直接变为0myAnimate(curDiv,{opacity:1},200,function(){var curDivSib = utils.siblings(this);for(var k = 0,len = curDivSib.length;k<len;k++){ utils.css(curDivSib[k],'opacity',0) } })continue} utils.css(curDiv,"zIndex",0) }//实现焦点对其for(i = 0,len = this.oLis.length;i<len;i++){var curLi = this.oLis[i]; i === this.step?utils.addClass(curLi,"bg"):utils.removeClass(curLi,"bg"); } },//控制自动轮播mouseEvent:function(){var _this = this;this.banner.onmouseover = function(){ window.clearInterval(_this.autoTimer); _this.bannerLeft.style.display = _this.bannerRight.style.display = "block"}this.banner.onmouseout = function(){ _this.autoTimer = window.setInterval(function(){ _this.autoMove.call(_this) },_this.interval); _this.bannerLeft.style.display = _this.bannerRight.style.display = "none"} },//实现焦点切换tipEvent:function(){var _this = this;for(var i = 0,len = this.oLis.length;i<len;i++){var curLi = this.oLis[i]; curLi.index = i; curLi.onclick = function(){ _this.step = this.index; _this.setBanner(); } } },//实现左右切换leftRight:function(){var _this = this;this.bannerRight.onclick = function(){ _this.autoMove(); };this.bannerLeft.onclick = function(){if(_this.step === 0){ _this.step = _this.jsonData.length; } _this.step--; _this.setBanner(); } },//当前插件的唯一入口 命令模式:init相当于指挥室,指挥各军队协同作战init:function(){var _this = this;this.getData();this.bindData(); window.setTimeout(function(){ _this.lazyImg(); },500);this.autoTimer = window.setInterval(function(){ _this.autoMove(); },this.interval);this.mouseEvent();this.tipEvent();this.leftRight();return this; } } window.AutoBanner = AutoBanner }()//使用var banner1 = new AutoBanner('banner','json/banner.txt',1000)
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