模拟器初次打开和下拉刷新都正常： [图片] 真机测试初次打开正常下拉刷新异常： [图片] raw2D: function(highData, lowData){     wx.createSelectorQuery().select('#myCanvas').fields({node: true, size: true}).exec((res)=>{       var canvas = res[0].node       const systemInfo = wx.getSystemInfoSync()       const screenWidth = systemInfo.screenWidth       const screenHeight = systemInfo.screenHeight       const dpr = systemInfo.pixelRatio       const ctx = canvas.getContext('2d')       ctx.clearRect(0, 0, canvas.width, canvas.height) // 清空canvas       const xOffset = screenWidth / 10  // x轴的偏移量       const groupSpacing = screenWidth / 5 // 5等分屏幕宽度       var sh = screenHeight * 0.4 * 0.6  // canvas的宽度       canvas.width = screenWidth * dpr       canvas.height = screenHeight * dpr * 0.4 * 0.6       ctx.scale(dpr, dpr)       // 获取每日最高温度的最大值和每日最低温度的最小值       var maxHighTemp = this.maxNum(highData);       var minLowTemp = this.minNum(lowData);       // 获取5日温度的最大差值(canvas图片的网格数)       var grid = maxHighTemp-minLowTemp;       // 每一canvas网格的像素大小       const distance = Math.floor(sh / grid)        const new_distance = Math.floor(distance * (grid - 2) / grid)       ctx.lineWidth = 2;       ctx.font = '16px sans-serif';       // highData开始       ctx.beginPath()       ctx.fillStyle = "#CD5555"       ctx.strokeStyle = "#CD5555"       var htX = 0, htY = 0       const TextOffset = 10       for (let i = 0; i < highData.length; i++) {         htX = i * groupSpacing + xOffset         htY = (maxHighTemp - highData[i]) * new_distance + distance + new_distance         if (i==0){           ctx.moveTo(htX, htY)           ctx.fillText(highData[i], htX-TextOffset, htY-TextOffset)         }else{           ctx.lineTo(htX, htY)           ctx.fillText(highData[i], htX-TextOffset, htY-TextOffset)         }       }     ctx.stroke()     // lowData开始     ctx.beginPath()     ctx.fillStyle = "black"     ctx.strokeStyle = "black"     var ltX = 0, ltY = 0     for (let i = 0; i < lowData.length; i++) {       ltX = i * groupSpacing + xOffset       ltY = (sh - (lowData[i] - minLowTemp) * new_distance) - distance       if (i==0){         ctx.moveTo(ltX, ltY)         ctx.fillText(lowData[i], ltX-TextOffset, ltY-TextOffset)       }else{         ctx.lineTo(ltX, ltY)         ctx.fillText(lowData[i], ltX-TextOffset, ltY-TextOffset)       }     }     ctx.stroke()   }) },

<image wx:if="{{img}}" src="{{img}}"></image> [图片] 图片保存在云服务器，报本地路径 /pages/index/xxx 错误，但图片可以正常显示