前端直传文件到阿里oss

var signedObj = {
    OSSAccessKeyId: "XXX"
    dir:"XXX/",
    expire:XXX,
    host:"http://oss-cn-beijing.aliyuncs.com"
    policy:"XXX"
    signature:"XXX"
}

// key指定完整的文件路径
signedObj['key'] = signedObj['dir'] + '/' + "${filename}"
// 否则默认成功返回204，不太喜欢
signedObj['success_action_status'] = 201

var formData = new FormData();

for(const key in signedObj) {
  formData.append(key, signedObj[key])
}

//file要放最后
formData.append("file", file)

http.post('http://oss-cn-beijing.aliyuncs.com/XXX', formData, {
  headers: {
    'Content-Type': 'multipart/form-data'
  }
});

const reg = /<Location>([sS]+)</Location>/gi
const newFilePath = reg.exec(result)[1]