js轮播图的插件化封装

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+=&#39;<div><img src="" alt="" trueImg="&#39;+curData[&#39;img&#39;]+&#39;"></div>';
                    i===0?str2+="<li class=&#39;bg&#39;></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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