``` api.imageCache({ url: 'http://a.hiphotos.baidu.com/image/w%3D400/sign=2abe1c77d4ca7bcb7d7bc62f8e086b3f/64380cd7912397ddf9f4bdb05a82b2b7d1a287f0.jpg' }, function(ret, err) { var url = ret.url; }); ```