AyaWo.Web/Content/zui/dist/lib/imgready/imgready.js

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/* ========================================================================
 * TangBin: image.ready.js
 * http://www.planeart.cn/?p=1121
 *
 * ZUI: The file has been changed in ZUI. It will not keep update with the
 * original version in the future.
 * http://zui.sexy
 * ========================================================================
 * @version 2011.05.27
 * @author  TangBin
 * ======================================================================== */


/*! TangBin: image.ready.js http://www.planeart.cn/?p=1121 */

(function($) {
    'use strict';

    /**
     * Image ready
     * @param {String}  image url
     * @param {Function}  callback on image ready
     * @param {Function}  callback on image load
     * @param {Function}  callback on error
     * @example imgReady('image.png', function () {
        alert('size ready: width=' + this.width + '; height=' + this.height);
      });
     */
    $.zui.imgReady = (function() {
        var list = [],
            intervalId = null,

            // 用来执行队列
            tick = function() {
                var i = 0;
                for(; i < list.length; i++) {
                    list[i].end ? list.splice(i--, 1) : list[i]();
                }!list.length && stop();
            },

            // 停止所有定时器队列
            stop = function() {
                clearInterval(intervalId);
                intervalId = null;
            };

        return function(url, ready, load, error) {
            var onready, width, height, newWidth, newHeight,
                img = new Image();

            img.src = url;

            // 如果图片被缓存，则直接返回缓存数据
            if(img.complete) {
                ready.call(img);
                load && load.call(img);
                return;
            }

            width = img.width;