问调用cos.putObject时，报错lack of required params？

提问于 2018-06-03 00:04:31

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报错缺少要求的参数，不明白缺少什么参数
控制台打印的params:
Body:ReadStream {_readableState: ReadableState, readable: true, domain: null, _events: {…}, _eventsCount: 1, …}
Bucket:"xcxtest-1256667224"
ContentLength:108415
Region:"ap-guangzhou"
key:"1527954943802-Bk_WAVgxm.png"
__proto__:Object