/**
 * 鍥剧墖棰勫姞杞芥彃浠禤reload
 * 
 * @param array imgs  棰勫姞杞界殑鍥剧墖鍦板潃鏁扮粍鍒楄〃
 * @param Object options  閰嶇疆鍙傛暟
 */

(function ($) {
    function Preload(imgs, options) {
        this.imgs = (typeof imgs === 'string') ? [imgs] : imgs;
        this.options = {
            order: false, //榛樿鍊糵alse,浠ｈ〃鏃犲簭鍔犺浇
            minTimer: 0, //瀹屾垚鍔犺浇鐨勬渶灏戞椂闂达紝鍗曚綅ms,榛樿涓?锛屼竴鑸睍绀虹被鍨嬬殑loading鍔ㄧ敾浼氶渶瑕佽缃
            each: null, //鍗曞紶鍥剧墖鍔犺浇瀹屾墽琛岀殑鏂规硶,涓€鑸槸淇敼杩涘害鐘舵€
            end: null //鎵€鏈夊浘鐗囧姞杞藉畬鎵ц鐨勬柟娉曪紝涓€鑸槸闅愯棌loading椤
        };
        this.timer = Date.now();
        this.init(options);
    };
    //鎻掍欢鍒濆鍖
    Preload.prototype.init = function (options) {
        //閰嶇疆鍙傛暟鍚堝苟
        this.options = $.extend(this.options, options);
        if (this.options.order) {
            this.ordered(); //鏈夊簭鍔犺浇
        } else {
            this.unordered(); //鏃犲簭鍔犺浇
        }
    };
    // 鏈夊簭鍔犺浇
    Preload.prototype.ordered = function () {
        var that = this,
            imgs = this.imgs,
            len = imgs.length,
            count = 0,
            options = this.options;
        load();

        function load() {
            var img = new Image();
            $(img).on('load error', function () {
                options.each && options.each(count);
                if (count >= len-1) {
                    //鎵€鏈夊浘鐗囧姞杞藉畬姣?妫€鏌ユ槸鍚︽弧瓒虫渶灏弆oading鏃堕棿
                    var timerCount = Date.now() - that.timer;
                    if (timerCount < options.minTimer) {
                        console.log("111")
                        var timeout = options.minTimer - timerCount;
                        setTimeout(function () {
                            options.end && options.end();
                        }, timeout);
                    }else{
                        options.end && options.end();
                    }
                } else {
                    load();
                }
                count++

            });
            // onload鍑芥暟瑕佸啓鍦ㄦ敼鍙榮rc鍓?杩欐牱纭繚浜唎nload鍑芥暟涓€瀹氫細琚皟鐢

            img.src = imgs[count];
        }
    };
    // 鏃犲簭鍔犺浇
    Preload.prototype.unordered = function () {
        var that = this,
            imgs = this.imgs,
            len = imgs.length,
            count = 0,
            options = this.options;
        for (var i = 0; i < len; i++) {
            var img = new Image();
            $(img).on('load error', function () {
                options.each && options.each(count);
                if (count >= len-1) {
                    //鎵€鏈夊浘鐗囧姞杞藉畬姣?妫€鏌ユ槸鍚︽弧瓒虫渶灏弆oading鏃堕棿
                    var timerCount = Date.now() - that.timer;
                    if (timerCount < options.minTimer) {
                        var timeout = options.minTimer - timerCount;
                        setTimeout(function () {
                            options.end && options.end();
                        }, timeout);
                    }else{
                        options.end && options.end();
                    }
                }
                count++;
            })
            img.src = imgs[i];
        }
    };
    //鎵╁睍鍒癹Query瀵硅薄涓
    $.extend($,{
        preload: function (imgs, options) {
            new Preload(imgs, options);
        }
    });
})(jQuery);