向下滚动页面加载图片的js

时间：2023-03-09 19:42:23
向下滚动页面加载图片的js

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_width: 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>

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