尊敬的微信团队，求教一个问题，新手，实在搞不懂。 cameraContext.onCameraFrame((frame) => { let uint8Array=new Uint8ClampedArray(frame.data); for(var h=0;h<height;h++)      {       for(var w=0;w<width;w++)       {         var pixelIndex=((h*width)+w)*4;//rgba;         var pixelRed=uint8Array[pixelIndex];         var pixelGreen=uint8Array[pixelIndex+1];         var pixelBlue=uint8Array[pixelIndex+2];       }     } } 问题： 上代码获取pixelRed和pixelGreen和pixelBlue都为零？想获取pixelBlue的值0~255，如何实现，谢谢了。 麻烦回复，恳教大家帮帮忙，就是要从frame.data获取每个像素点的r g b值。麻烦了。

确认安装了nodejs -v v14.16.0 在微信开发工具 const crypto = require("crypto"); 报 "crypto.js" is not defined. 外部命令 node v3.js没有报错，但是开发工具const crypto = require("crypto");老是报错，请问如何解决？麻烦了。 const crypto = require('crypto'); function sha256(message, secret = '', encoding) {     const hmac = crypto.createHmac('sha256', secret)     return hmac.update(message).digest(encoding) } function getHash(message, encoding = 'hex') {     const hash = crypto.createHash('sha256')     return hash.update(message).digest(encoding) } function getDate(timestamp) {     const date = new Date(timestamp * 1000)     const year = date.getUTCFullYear()     const month = ('0' + (date.getUTCMonth() + 1)).slice(-2)     const day = ('0' + date.getUTCDate()).slice(-2)     return `${year}-${month}-${day}` } function main(){     // 密钥参数     const SECRET_ID = "Aetet*"     const SECRET_KEY = "sdfasdf"     const endpoint = "iai.tencentcloudapi.com"     const service = "iai"     const region = "ap-beijing"     const action = "DetectFace"     const version = "2020-03-03"     //const timestamp = getTime()     const timestamp = Math.round(new Date().getTime()/1000) + "";     //时间处理, 获取世界时间日期     const date = getDate(timestamp)     // ************* 步骤 1：拼接规范请求串 *************     const signedHeaders = "content-type;host"     const payload = "{\"Image\": \"\"}"     const hashedRequestPayload = getHash(payload);     const httpRequestMethod = "POST"     const canonicalUri = "/"     const canonicalQueryString = ""     const canonicalHeaders = "content-type:application/json; charset=utf-8\n" + "host:" + endpoint + "\n"     const canonicalRequest = httpRequestMethod + "\n"         + canonicalUri + "\n"         + canonicalQueryString + "\n"         + canonicalHeaders + "\n"         + signedHeaders + "\n"         + hashedRequestPayload     console.log(canonicalRequest)     console.log("----------------------------")     // ************* 步骤 2：拼接待签名字符串 *************     const algorithm = "TC3-HMAC-SHA256"     const hashedCanonicalRequest = getHash(canonicalRequest);     const credentialScope = date + "/" + service + "/" + "tc3_request"     const stringToSign = algorithm + "\n" +         timestamp + "\n" +         credentialScope + "\n" +         hashedCanonicalRequest     console.log(stringToSign)     console.log("----------------------------")     // ************* 步骤 3：计算签名 *************     const kDate = sha256(date, 'TC3' + SECRET_KEY)     const kService = sha256(service, kDate)     const kSigning = sha256('tc3_request', kService)     const signature = sha256(stringToSign, kSigning, 'hex')     console.log(signature)     console.log("----------------------------")     // ************* 步骤 4：拼接 Authorization *************     const authorization = algorithm + " " +         "Credential=" + SECRET_ID + "/" + credentialScope + ", " +         "SignedHeaders=" + signedHeaders + ", " +         "Signature=" + signature     console.log(authorization)     console.log("----------------------------")     const Call_Information = 'curl -X POST ' + "https://" + endpoint         + ' -H "Authorization: ' + authorization + '"'         + ' -H "Content-Type: application/json; charset=utf-8"'         + ' -H "Host: ' + endpoint + '"'         + ' -H "X-TC-Action: ' + action + '"'         + ' -H "X-TC-Timestamp: ' + timestamp.toString() + '"'         + ' -H "X-TC-Version: ' + version + '"'         + ' -H "X-TC-Region: ' + region + '"'         + " -d '" + payload + "'"     console.log(Call_Information) } main()

支付成功后，回调时，回复了下面信息： <xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml> 还是执行十次以上回调，如何处理，谢谢！

尊敬的微信团队： <canvas type="2d" id="canvas'"/> const query = wx.createSelectorQuery() query.select('#canvas').fields({ node: true, size: true }) .exec((res) => {} 执行这一句老是提示：TypeError: Cannot read property 'createView' of undefined错误，如果去除type="2d"就不会错误，但是获取不到node，node==null; }); 求人，谢谢。

问下大家，我的var uploadTask=wx.uploadFile({...})老是出现了onUploadTaskStateChange 1、2、3、4... not found问题，请问如何解决？ 还有，wx.uploadFile在执行中如何中断它？ 谢谢！

下面代码，无论that放哪里，怎么整都提示：fcanvasToTempFilePath: fail canvas is empty，真是无语，麻烦求解，谢谢。 onReady: function ()   {     var that = this;     var context = wx.createCanvasContext('mycanvas',that);     wx.chooseImage     ({       success: function (res)       {         context.drawImage(res.tempFilePaths[0], 0, 0, 150, 100);         context.fillStyle = "#FF0000";         context.fillRect(0, 0, 50, 50);         context.draw(true, setTimeout(function()         {           wx.canvasToTempFilePath           ({             destWidth: 150,             destHeight: 100,             canvasId: 'mycanvas',             success: function (res)             {               console.log('1212' + res.tempFilePath);             },             fail: function (res) {console.log(res);}           },that);         },300));       }     });   }

问userInfo: {}什么意思?userInfo: {}和userInfo: null区别?

Stable 1.03.2011120版本在代码前面数字点击，不会出现断点背景。求问。谢谢。

尊敬微信团队，问服务器统一下单签名错误。 我的商户：1489601702 以前服务器统一下单正常，换了服务器106.55.172.80后，下单提示签名错误。 同样代码、参数、内容随便本地找台电脑和ip进行下单调试都能正常获取到返回的成功信息，就是同样代码、内容、参数 放到106.55.172.80服务器就是出现签名错误，无语，求解？密匙重置了好多次，服务器重启很多次，依然签名错误。 <xml> <appid>wx2d7d9b2a8a33335e</appid> <body>yy</body> <mch_id>1489601702</mch_id> <nonce_str>mn7bbn8smej4bn1t99a3ho6tgyk9in2k</nonce_str> <notify_url>http://ee.playcn.xyz/payback</notify_url> <out_trade_no>47466267423909804836512093020612</out_trade_no> <total_fee>25</total_fee> <trade_type>NATIVE</trade_type> </xml> 问上面xml有哪些问题？