<canvas class="canvas" canvas-id="canvas"
				:style="{ height: canvasHeight + 'px', width: canvasWidth + 'px'  }"></canvas>

 //默認(rèn)初始值   canvasWidth1  canvasHeight1
data() {
        return {
			ctx: null,
			canvasWidth: 1080,
			canvasHeight: 1440,
        }
    },

wx.draw(false, () =>{
  wx.canvasToTempFilePath({
       x: 0,
       y: 0,
       canvasId: 'shareCanvas',  // shareCanvas 為制定 繪圖canvas 的ID
       success: (res) => {
            this.storeImgPath = res.tempFilePath
            ....寫入生成完成的邏輯
       },
      complete: (res) => {
           wx.hideLoading()
       }
  })
})

//萬(wàn)能代碼，不能用你回來(lái)找我，能用可以雙擊點(diǎn)贊評(píng)論666	
console.log('正在繪制')
			this.ctx.draw(false,(()=> {
				setTimeout(() => {
				uni.canvasToTempFilePath({
					x: 0,
					y: 0,
					width: this.canvasWidth1,
					height: this.canvasHeight1,
					destWidth: this.canvasWidth1,
					destHeight: this.canvasHeight1,
					canvasId: 'myCanvas',quality:0.6,
					success: res => {
						// 在H5平臺(tái)下，tempFilePath 為 base64
						console.log(res,'繪制完成===',)
						//上傳
						uni.uploadFile({
							url: url, //僅為示例，非真實(shí)的接口地址
							filePath:res.tempFilePath,
							header: {
								'token': self.$store.state.token,"version":"100.0.00"
							},
							name: 'file',
							formData: {},
							success: (uploadFileRes) => {
								console.log('uploadFileRes===1111',uploadFileRes)
								uni.hideLoading()
							},
							fail(err) {
								console.log(err)
								uni.hideLoading()
							}
						});
					//	this.pictureArr.push(res.tempFilePath);
					},
					fail(err) {
						console.log(err)
						uni.showToast({
							title:'上傳圖片失敗!',icon:'none',
							duration: 3000
						})
						uni.hideLoading()
					}
				}, this)
				}, 3500)
			})());