问语音识别 AuthFailure.SignatureFailure 签名错误怎么解决？

//将data换成文档中给的例子，能生成正确的Signature

//但是用我自己id和key还有参数生辰的签名就报错

//===========↓ 附上代码↓ ===========

//从data读取secretKey

let secretKey = this.data.SecretKey;

//参数

let requestData = {

Action: "SentenceRecognition",

Version: "2019-06-14",

ProjectId: 0,

SubServiceType: 2,

EngSerViceType: "16k_zh",

SourceType: 1,

VoiceFormat: "mp3",

UsrAudioKey: new Date().getTime(),

Data: this.data.base64File,

DataLen: this.data.base64Length,

FilterDirty: 1,

FilterModal: 1,

FilterPunc: 1,

Timestamp: parseInt(new Date().getTime() / 1000),

Nonce: parseInt(new Date().getTime() / 1000),

SecretId: this.data.SecretId,

}

//自己定义了ksort排序

let data = ksort(requestData);

let arr = [];

for (var x in data) {

data[x] = encodeURIComponent(data[x]);

arr.push(x + '=' + data[x]);

}

let str = arr.join('&');

//签名生成

let sign = 'POSTasr.tencentcloudapi.com /?' + str;

//后面有b64_hmac_sha1()

sign = encodeURIComponent(b64_hmac_sha1(secretKey, sign));

data['Signature'] = sign;

后面用wx.request()请求就显示签名错误了

Error:{Code:"AuthFailure.SignatureFailure",Message:"The provided credentials could not be validated. Please check your signature is correct."}