js代码 async getImage (url,width, height) {       const off = wx.createOffscreenCanvas({type:'2d'})     const image = off.createImage()        await new Promise((resolve, reject)=>{             image.onload = resolve  // 绘制图片逻辑       image.src = url     })     return image     },     aaa(){       const now = new Date();       const year = now.getFullYear();       const month = now.getMonth() + 1;       const day = now.getDate();       const date = `${year}年${month}月${day}日`;       const no = `F${year}182006`;       const that=this;       wx.createSelectorQuery().select('#myCanvas').fields({ node: true, size: true }).exec((cres) => {         //在这里可以下获取到canvas组件了，然后创建成画板画布。           console.log(cres);           var rect = cres[0]           console.log(rect)           var textCanvas = rect.node  // 重点1           var ctx = textCanvas.getContext('2d')  // 重点2//创建画布           that.getImage("../../images/card.jpg",800,1000).then(image=>{             ctx.drawImage(image, 0, 0,1000,800)           })           ctx.font ='28px';           ctx.fillStyle='#000';           ctx.fillText(`同志在 ${year} 年 1 月 1 日至 ${month} 月 ${day} 日参加了`, 240, 380);           ctx.fillText(`编号:${no}`,170 , 640);           ctx.fillText(`${date}`, 670, 640);           wx.canvasToTempFilePath({             canvas:textCanvas,             success: (res) => {               console.log('成功生成临时文件路径：', res.tempFilePath);               wx.downloadFile({                 url: res.tempFilePath,                 success: (downloadRes) => {                   if (downloadRes.statusCode === 200) {                     console.log(downloadRes)                     wx.saveFile({                       tempFilePath: downloadRes.tempFilePath,                       success: (saveRes) => {                         console.log(saveRes)                         console.log('证书保存路径：', saveRes.savedFilePath);                         wx.showToast({                           title: '证书下载成功',                           icon: 'success',                         });                       },                       fail: (err) => {                         wx.showToast({                           title: '证书下载失败'+err,                           icon: 'none',                         });                       },                     });                   }                 },                 fail: (err) => {                   wx.showToast({                     title: '证书下载失败'+err,                     icon: 'none',                   });                   console.log(err);                 },               });             },             fail: (err) => {               console.error('生成临时文件路径失败：', err);               wx.showToast({                 title: '证书生成失败',                 icon: 'none',               });             },           });         })     }, wxml: <canvas id="myCanvas" type="2d" style="width:1000px;height:800px"></canvas> 结果： [图片]

我一点击进度条就会重新开始播放，什么原因[图片]