1、现在已经在云函数接收到wx.cloud.CDN返回的URL了，如下： http://vweixinf.tc.qq.com/301/20303/stodownload?m=21310b386f8f96354a3934936661dc87&filekey=30350201010421301f0202012d0402535a041021310b386f8f96354a3934936661dc87020300d9c4040d00000004627466730000000131&hy=SZ&storeid=323032303039303831303531323130303031643961373839626234316361626366343566303930303030303132643030303034663466&bizid=1023 2、上传云存储用的API是cloud.uploadFile，入参是：[图片] uploadFile接收的fileContent是Buffer或fs.ReadStream类型 问题：怎样把wx.cloud.CDN的URL变成Buffer或fs.ReadStream类型，即在云函数中怎样把链接里面的数据下载下来并上传到云存储？

请教，微信web工具生成的小程序框架，报告Uncaught ReferenceError: define is not defined，原因是什么？ util.js:1 Uncaught ReferenceError: define is not defined(anonymous function) @ util.js:1 app.js:1 Uncaught ReferenceError: define is not defined(anonymous function) @ app.js:1 index.js:1 Uncaught ReferenceError: define is not defined(anonymous function) @ index.js:1 appservice:16 Sun Jul 23 2017 21:40:57 GMT+0800 (中国标准时间) page 编译错误 appservice:17  pages/index/index 出现脚本错误或者未正确调用 Page()(anonymous function) @ appservice:17 logs.js:1 Uncaught ReferenceError: define is not defined(anonymous function) @ logs.js:1 appservice:22 Sun Jul 23 2017 21:40:57 GMT+0800 (中国标准时间) page 编译错误 appservice:23  pages/logs/logs 出现脚本错误或者未正确调用 Page()