网页H5图片预览滑动模仿新浪微博插件

首先看使用方法:

    //注意一定要页面加载完成后再调用
      $(function(){
                //调用方式
                $("#picList").createImgWin();
    })

插件内容介绍:

1.前台html元素格式:

<div id="picList">
                       //要预览的图片
            <img src="img/834.jpg" />
            <img src="img/timg.jpg" />
            <img src="img/cbd.jpg" />
            <img src="img/shuijiao.jpg" />
</div>

2.调用方法封装

    //给jquery添加调用函数 主要是为了满足用户对Jquery书写习惯
      $.fn.extend({
                createImgWin:function(){
                    var ImgWin=new scrollWin(this);
                }
                
         })

3.对象构造函数封装:

为了使图片加载一次之后不用重新加载 加入已加载完成的的图片的索引

                    //类对象
    var scrollWin=function(target){
            this.picList=$(target).find("img");
            var that=this;
            //创建背景层
            function createBackPopup(){
                    var height = $(window).height()
                    //<!---黑色背景------->
                    var divBack = $(".container");
                    if(divBack.length < 1) {
                        divBack = $("<div></div>");
                        divBack.attr("class", "container");
                        divBack.width("100%");
                        divBack.css("position", "absolute").css("top", "0").css("z-index", "10").css("background-color", "black").css("width","100%")
                        divBack.height(height);                        
                        divBack.css("display", "none");
                        var tip=$("<div style='100%;margin-top:10px'></div>")
                        var topTip=$("<div class='topTip' style='background-color:#434343;color:#fff;text-align: center;' ></div>")
                        var picNumber=that.picList.length;
                        topTip.text("0/"+picNumber);
                        topTip.height(20)
                        topTip.width(40)
                        topTip.css("border-radius","10px").css("margin","5px auto")
                        tip.append(topTip)

                        divBack.append(tip)
                        var imgDiv = $("<div class='imgDiv' style='display: flex;justify-content: flex-start;100%;'></div>");
                        divBack.append(imgDiv);
                        $("body").append(divBack);
                    }
                    return divBack;
            }
            this.backPopup=createBackPopup();
                
            //缓存的图片索引
            this.picIndex=[];
            //绑定点击事件
            this.bindClick(this.picList);
            //绑定滑动事件
            that.bindMove();
            }

4. prototype函数封装:

scrollWin.prototype={
                //点击事件
                bindClick:function(list){
                    var that=this;
                    $.each(list, function(index, item) {
                    //点击事件
                    $(item).on("click", function() {
                        
                        var src = $(this).attr("src")
                        //创建图片层
                        that.createImgPopup(src,index);
                    })
                  });
                  
                },
                //滑动事件
                bindMove:function(){
                    //绑定滑动事件
                    var startX,startY, that=this;
                    //开始触摸
                    this.backPopup.on("touchstart", function(e) {
                        e.preventDefault();
                        startX = e.originalEvent.changedTouches[0].pageX, startY = e.originalEvent.changedTouches[0].pageY;
                    });
                    //滑动结束
                    this.backPopup.on("touchend", function(e) {
                     
                        e.preventDefault();
                        var moveEndX,X,index,picNumber;
                        moveEndX = e.originalEvent.changedTouches[0].pageX, 
                        index=$(".imgDiv").find("img[class=current]").attr("index");
                        index=parseInt(index);
                        if(isNaN(index))
                        return;
                        X = moveEndX - startX;
                        picNumber=that.picList.length;
                        //滑动事件判断
                        if(X > 0) {
                            //索引加1 right to left
                             index--;
                             if(index<1)
                              index=picNumber
                             $(".topTip").text(index+"/"+picNumber); 
                              //判断之前是否已经加载该图片
                             var nextimg= $(".imgDiv").find("img[index="+index+"]")
                             if(!that.isInArray(that.picIndex,index)){
                                 var imgEle=that.picList[index-1]
                                 //获取下一张图片的路径
                                 var src= $(imgEle).attr("src")
                                  nextimg =new Image(); //创建一个Image对象，实现图片的预下载     
                                  nextimg.src = src;  
                                // nextimg = $("<img index="+index+" />")
                                  $(nextimg).attr("index", index);
                                  //当前标识
                                  $(nextimg).attr("class", "current");
                                 that.picIndex.push(index); 
                                  
                                 nextimg.onload=function(){
                                     
                                     //之前的图片隐藏
                                    that.hiddenImg(index)
                                         //添加元素
                                    $(".imgDiv").append(nextimg) 
                                   //元素调整
                                     that.resizeImg($(nextimg));
                                  }
                            }//已经存在
                             else{
                                 
                                 //之前的图片隐藏
                                  that.hiddenImg(index)
                                   nextimg.css("display","block")
                                   nextimg.attr("class", "current");
                             }
                              
                        } else if(X < 0) {
                            //索引加1 right to left
                              index++;
                             if(index>picNumber)
                              index=1;
                            
                             $(".topTip").text(index+"/"+picNumber); 
                             //判断之前是否已经加载该图片
                             var nextimg= $(".imgDiv").find("img[index="+index+"]")
                             if(!that.isInArray(that.picIndex,index)){
                                 
                                 var imgEle=that.picList[index-1]
                                 //获取下一张图片的路径
                                 var src= $(imgEle).attr("src")
                                  nextimg =new Image(); //创建一个Image对象，实现图片的预下载     
                                  nextimg.src = src;  
                                // nextimg = $("<img index="+index+" />")
                                  $(nextimg).attr("index", index);
                                  //当前标识
                                  $(nextimg).attr("class", "current");
                                 that.picIndex.push(index); 
                                 
                                 nextimg.onload=function(){
                                     
                                     //之前的图片隐藏
                                     that.hiddenImg(index)
                                         //添加元素
                                    $(".imgDiv").append(nextimg) 
                                   //元素调整
                                     that.resizeImg($(nextimg));
                                  }
                             }
                             //已经存在
                             else{
                                 //之前的图片隐藏
                                  that.hiddenImg()
                                   nextimg.css("display","block")
                                   nextimg.attr("class", "current");
                             }
                            
                        }else{
                            that.hiddenPop()
                        }
                    
                    });
                 },
                 //工具方法 判断是否已经存在在索引列表中
                isInArray:function(arr,value){
                    for(var i = 0; i < arr.length; i++){
                        if(value === arr[i]){
                            return true;
                        }
                    }
                    return false;
                 },
                 //隐藏指定图片
                hiddenImg:function(index){
                   //图片隐藏
                    var otherimg= $(".imgDiv img[index!="+index+"]")
                     $.each(otherimg, function(index ,item) {
                                      $(item).css("display","none")
                                      $(item).attr("class", "other");
                    });
               },
                //创建图片元素 
                createImgPopup:function(src,index){
                    var that=this;
                    var height = $(window).height()
                    var divBack= $(".container")
                    divBack.css("display", "block")
                    //索引
                    var picNumber=that.picList.length;
                  
                    index=index+1;
                    //顶部编号
                    $(".topTip").text(index+"/"+picNumber);
                    //判断是否已经有该元素
                    if(!that.isInArray(that.picIndex,index)){
                        //<!----图片层----->
                        var img = $("<img index="+index+" />")
                        img.attr("src", src);
                        img.attr("class", "current");
                        
                        that.picIndex.push(index); 
                        img[0].onload=function(){
                            //添加元素
                            $(".imgDiv").append(img)
                            that.hiddenImg(index)
                            //元素调整
                            that.resizeImg(img);
                         }
                    }
                    //如果已经存在
                    else{
                        that.hiddenImg(index);
                       //只显示该元素
                        var curimg= $(".imgDiv").find("img[index="+index+"]")
                        $(curimg).css("display","block")
                         $(curimg).attr("class", "current");
                        
                    }
                    
                },
                //隐藏整个框架
                hiddenPop:function(){
                       this.backPopup.css("display", "none")
                },
                //图片大小位置按比例调整
                resizeImg:function(img){
                    var height = $(window).height()
                    
                    var rate = img.height() / img.width();
                    var imgH, imgW;
            
                    
                    if(img.width() > $(window).width()) {
                        imgW = $(window).width();
                    } else {
                        imgW = img.width()
                    }
                    imgH = imgW * rate;
                    if(imgH>height-20){
                        imgH=height-20;
                        imgW=imgH/rate;
                        if(imgW> $(window).width())
                            imgW= $(window).width()
                    }
                    img.height(imgH)
                    img.width(imgW)
                    //垂直居中
                    img.css("margin-top", (height-40- imgH) / 2)
                    
                }
            }
            

5.效果预览

//

github地址:h5图片预览滑动