慢速API先是几个加载较慢的API（都是国外的api） http://lorempixel.com/1600/900https://unsplash.it/1600/900?randomhttps://uploadbeta.com/api/pictures/random/https://unsplash.it/1600/900?random Bing每日一图https://api.dujin.org/bing/1366.php 分辨率为 1366x768 https://api.dujin.org/bing/1920.php 分辨率为 1920x1080 高清壁纸https://api.ixiaowai.cn/gqapi/gqapi.php 二次元动漫https://img.xjh.me/random_img.phphttp://www.dmoe.cc/random.phphttp://api.mtyqx.cn/api/random.phphttp://api.mtyqx.cn/tapi/random.phphttps://img.asmdh.com/img.phphttps: ...