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BingWallpaper

需求

（url）http://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1&mkt=en-US
通过如上url获取到一个json对象
（json）

{
    "images": [
        {
            "startdate": "20160329", 
            "fullstartdate": "201603291600", 
            "enddate": "20160330", 
            "url": "http://s.cn.bing.net/az/hprichbg/rb/WestBow_ZH-CN11767628474_1920x1080.jpg", 
            "urlbase": "/az/hprichbg/rb/WestBow_ZH-CN11767628474", 
            "copyright": "苏格兰，爱丁堡，西弓街 (© Rory McDonald/Getty Images)", 
            "copyrightlink": "http://www.bing.com/search?q=%E7%88%B1%E4%B8%81%E5%A0%A1&form=hpcapt&mkt=zh-cn", 
            "wp": true, 
            "hsh": "e60edeea9c4614012b0ad920eeb2cdef", 
            "drk": 1, 
            "top": 1, 
            "bot": 1, 
            "hs": [ ], 
            "msg": [
                {
                    "title": "今日图片故事", 
                    "link": "http://www.bing.com/search?q=%E7%88%B1%E4%B8%81%E5%A0%A1&form=pgbar1&mkt=zh-cn", 
                    "text": "爱丁堡"
                }
            ]
        }
    ], 
    "tooltips": {
        "loading": "正在加载...", 
        "previous": "上一页", 
        "next": "下一页", 
        "walle": "此图片不能下载用作壁纸。", 
        "walls": "下载今日美图。仅限用作桌面壁纸。"
    }
}

获取json中的images下的url参数的值
（url2）http://s.cn.bing.net/az/hprichbg/rb/WestBow_ZH-CN11767628474_1920x1080.jpg
从url2处下载图片，保存图片，将文件重命名为Bing网站上展示这张图片的日期。
将url中的idx后面的参数由0进行++操作，下载下一张图片
到获取到所有能获取到的url2为止。