js代码 scroll.photo.js :
window.imgscroll = { options: { target: null, //插入图片的目标位置 img_list: null, //图片数组 [{ url: "/CMF01_000.jpg"},{ url: "/CMF01_001.jpg"}] img_max: 0, //图片数量 img_num: 0, //图片累计已加载的数量 step_max: 3, //每轮加载图片的数量 从0开始计数 step_num: 0, //每轮已加载图片的数量 img_obj: new Image(), s_scroll: 0, //滑动条的Y轴位置 w_height: 0, //页面内容的高度 l_height: 500, //小于此参数则开始加载图片 w_ 640 //浏览器窗口宽度 }, onLoad: function(){ if(this.options.img_num >= this.options.img_max){ $("#img_load").hide(); //隐藏loading图标 return; } this.options.img_obj.src = this.options.img_list[this.options.img_num].url; this.options.img_obj.onload = function(){ imgscroll.endLoad(this.width); }; }, endLoad: function(width){ width = this.options.w_width > width? width+"px": "98%"; this.options.target.append('<div style="text-align:center;color:#999;padding-bottom:10px;"><img src="'+this.options.img_list[this.options.img_num].url+'" width="'+width+'"><br /><span>'+ (this.options.img_num+1) +'/'+ this.options.img_max +'</span></div>');
this.options.img_num += 1; if(this.options.step_num < this.options.step_max){this.options.step_num += 1; this.onLoad(); }else{ //结束一轮加载后将每轮已加载图片数量归零 this.options.step_num = 0; } }, beLoad: function(target,img_list){ this.options.target = target; this.options.img_list = img_list; this.options.img_max = img_list.length; this.options.l_height = $(window).height()*2; this.options.w_width = $("body").width(); //绑定滑动条的判定 $(window).scroll(function(){ imgscroll.options.s_scroll = $(window).scrollTop(); imgscroll.options.w_height = $("body").height(); if((imgscroll.options.w_height-imgscroll.options.s_scroll) < imgscroll.options.l_height){ if(imgscroll.options.step_num < 1) imgscroll.onLoad(); } }); this.onLoad(); } };
页面代码 :
<!DOCTYPE html> <html> <head> <title>向下滚动页面加载图片</title> <meta http-equiv="Content-type" content="text/html; charset=utf-8" /> <script type="text/javascript" src="js/jquery-1.9.1.min.js"></script> <script type="text/javascript" src="js/scroll.photo.js"></script> <script type="text/javascript">var imglist = [{ url: "CMF01_000.jpg"},{ url: "CMF01_001.jpg"},{ url: "CMF01_002.jpg"},{ url: "CMF01_003.jpg"},{ url: "CMF01_004.jpg"},{ url: "CMF01_005.jpg"},{ url: "CMF01_006.jpg"}]; $(function(){ imgscroll.beLoad($("#img_list"),imglist); }); </script> </head> <body style="background:#444;padding-top:20px;"> <div id="img_list"></div> <div id="img_load" style="text-align:center;color:#AAA;"><img src="loading.gif" /><br /><span>少女读取中...</span></div> </body> </html>