例如 小程序的生命周期 onLaunch,onHide onError,onPageNotFound是写在哪里呢?

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目前知道新canvas获取的context是canvasRendertingContext2D，其drawImage方法要求传入一个HTML的img节点，所以直接传入url会报错，查询文档后发现canvas.createImage()可以创建图片对象，实测也确实打印出了<img>，但是给创建好的img添加src后传入drawImage()中没有反应，也不报错，就是啥都不显示，不知道是怎么回事，往大佬指点。代码如下： /*----------wxml-------------*/ <canvas id="sharePic" type="2d"></canvas> /*-----------js--------------*/ onLoad: async function (options) {     //将图片的fileID换成真实url    var result = await wx.cloud.getTempFileURL({       fileList:[options.url]       })       console.log(result);     var url = result.fileList[0].tempFileURL;     //选择画布     var query = wx.createSelectorQuery();     query.select('#sharePic').node().exec(res=>{     console.log(res);       var shareCanvas = res[0].node;       var ctx = shareCanvas.getContext('2d');       //创建图片对象       var img = shareCanvas.createImage();       img.src = url;       console.log(img)       //画图，但是没反应       ctx.drawImage(img,25,10,300,300);      });    },

wx.request [图片]

操作过程： 1）使用微信号给微信公众号的测试号发送图片 2）公众号后台服务器收到消息，提取其中的MediaID 3）使用 https://api.weixin.qq.com/cgi-bin/media/get?access_token=30_F1P3QpH3S8z91O06OwPofaDAnsmrCwsHQ01OuEsVIeuR6gy9QkupLareH7h-nxqS_H36LrxepL6m_baVubc1tdq7HGFfy9ekjh3LJOTEBtsEVfivaqB7-XWo514AKRjAGAMWD&media_id=kc5h9GQCuU29QSD8dNG9gcwRRs-TWX4mMK4lxhk_DSL7ZnKOE9QikFnajZ9RTKPJ，GET方式拉取该图片数据 返回：{"errcode":40007,"errmsg":"invalid media_id hint: [Xg_W09612335]"}

云开发小程序在发布以后，还能通过小程序开发者工具来修改数据库里的数据吗？ 修改数据后需要重新发布吗？

"errCode":-501007,"errMsg":"subscribeMessage.send:fail Invalid request param" START RequestId: 9d9bf191-5aa9-11ea-8756-52540054168a Event RequestId: 9d9bf191-5aa9-11ea-8756-52540054168a 2020-02-29T04:11:53.902Z 9d9bf191-5aa9-11ea-8756-52540054168a { Error: errCode: -501007 invalid parameters | errMsg: subscribeMessage.send:fail Invalid request param at Object.callWXOpenAPI (/var/user/node_modules/wx-server-sdk/index.js:358:19) at <anonymous> at process._tickCallback (internal/process/next_tick.js:188:7) errCode: -501007, errMsg: 'subscribeMessage.send:fail Invalid request param' } END RequestId: 9d9bf191-5aa9-11ea-8756-52540054168a Report RequestId: 9d9bf191-5aa9-11ea-8756-52540054168a Duration:74ms Memory:256MB MemUsage:37.753906MB config.json { "permissions": { "openapi": [ "subscribeMessage.send" ] } } index.js // 云函数入口文件 const cloud = require('wx-server-sdk') cloud.init() // 云函数入口函数 exports.main = async (event, context) => { try { const result = await cloud.openapi.subscribeMessage.send({ touser: 'o1o3-4xgvaPwVLt7PKG4_KG7xmf4', page: 'index', data:{ thing2:{ value:'千岛鱼' }, amount3:{ value:'120' }, name4:{ value: '是不是忘了谁' }, thing6:{ value: '有鱼有虾' }, time5:{ value:'2018.5.15' } }, templateId: 'fwd9CstOmDbgC3WxAvoMct90AZ3kLE92AYZSejwAdVg', }) console.log(result) return result } catch (err) { console.log(err) return err } } 前端点击事件:share share() { wx.requestSubscribeMessage({ tmplIds: ['fwd9CstOmDbgC3WxAvoMct90AZ3kLE92AYZSejwAdVg'], success:(res)=>{ wx.cloud.callFunction({ name:'send' }).then((res)=>{ console.log(res) }) } }) }, [图片] 我是想发送给指定的openid的微信接受这条消息 求解决吧！！！！好多人都遇到这个问题

[图片]这段代码里的this.checkLoginReadyCallback是另外一个函数吗?app.js里没看到啊 

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var sctu[xh],html; sss:function(){     this.editorCtx.getContents({       success(res) {         html = res.html;         var i=0         var ss = res.html.replace(/<img [^>]*src=['"]([^'"]+)[^>]*>/gi, function (match, capture) {          url[i]=capture          i++         })         console.log(url)         var PromiseAllArr = [];//*********************用来存多个Promise         for (var i = 0; i < url.length; i++) {           console.log(i)           PromiseAllArr.push(             new Promise(function (resolve, reject) {             let that = this;             let xh=i;             wx.cloud.uploadFile({               cloudPath: "ssnew/" +rqzh.timeName(new Date()) +"-"+xh + ".jpg",               filePath: url[xh],               success(res) {                 console.log(html)                 html=html.replace(url[xh],res.fileID)                 sctu[xh] = res.fileID                 console.log(xh+"上传成功")                 // if (that.data.sctu.length==url.length){                 //   that.data.html = mm                 //   console.log(mm)                 //   that.data_updata()                 // }                 return resolve(res);               }, fail(res) {                 return reject(i+"个上传失败");                 console.log(url[xh])                 console.log('上传图片失败', res)               }             })            }))            }         Promise.all(PromiseAllArr).then(function (values) {           let that=this;           console.log(that.data.title)         }).catch(reason => {           console.log(reason)           wx.cloud.deleteFile({             fileList: sctu,             success(res){               console.log('删除已存文件')             }           })         });       }     })   } TypeError: Cannot read property 'data' of undefined     at ssnew.js? [sm]:181,我换成页面的函数，也提示找不到。