WebContent/lib/lazyload/lazyload.js

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/*!
 * author:jieyou
 * see https://github.com/jieyou/lazyload
 * part of the code fork from tuupola's https://github.com/tuupola/jquery_lazyload
 */
;(function(factory){
    if(typeof define === 'function' && define.amd){ // AMD
        // you may need to change `define([------>'jquery'<------], factory)` 
        // if you use zepto, change it rely name, such as `define(['zepto'], factory)`
        // if your jquery|zepto lib is in other path, change it such as `define(['lib\jquery.min'], factory)`
        define(['jquery'], factory)
    }else{ // Global
        factory(window.jQuery || window.Zepto)
    }
})(function($,undefined){
    var w = window,
        $window = $(w),
        defaultOptions = {
            threshold                   : 0,
            failure_limit               : 0,
            event                       : 'scroll',
            effect                      : 'show',
            effect_params               : null,
            container                   : w,
            data_attribute              : 'original',
            data_srcset_attribute       : 'original-srcset',
            skip_invisible              : true,
            appear                      : emptyFn,
            load                        : emptyFn,
            vertical_only               : false,
            minimum_interval            : 300,
            use_minimum_interval_in_ios : false,
            url_rewriter_fn             : emptyFn,
            no_fake_img_loader          : false,
            placeholder_data_img        : 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC',
            // for IE6\7 that does not support data image
            placeholder_real_img        : 'http://ditu.baidu.cn/yyfm/lazyload/0.0.1/img/placeholder.png'
            // todo : 将某些属性用global来配置，而不是每次在$(selector).lazyload({})内配置
        },
        isIOS = (/(?:iphone|ipod|ipad).*os/gi).test(navigator.appVersion),
        isIOS5 = isIOS && (/(?:iphone|ipod|ipad).*os 5/gi).test(navigator.appVersion),
        type // function

    function emptyFn(){}

    type = (function(){
        var object_prototype_toString = Object.prototype.toString
        return function(obj){
            // todo: compare the speeds of replace string twice or replace a regExp
            return object_prototype_toString.call(obj).replace('[object ','').replace(']','')
        }
    })()

    function belowthefold($element, options){
        var fold
        if(options._$container == $window){
            fold = ('innerHeight' in w ? w.innerHeight : $window.height()) + $window.scrollTop()
        }else{
            fold = options._$container.offset().top + options._$container.height()
        }