你好，麻烦提供能复现问题的代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）

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


<script>
	export default {
		data() {
			return {
				ctx: null,
				canvasId: 'canvas_id',
				canvasWidth: 0,
				canvasHeight: 0
			};
		},
		created() {
			this.ctx = uni.createCanvasContext(this.canvasId, this);
		},
		methods: {
			// 旋转图片
			rotateImage(src, angle) {
				uni.getImageInfo({
					src
				}).then(res => {
					const {
						width,
						height
					} = res
					this.canvasWidth = height
					this.canvasHeight = width
					setTimeout(() => {
						this.ctx.clearRect(0, 0, width, height)
						this.ctx.rotate(angle * Math.PI / 180)
						this.ctx.translate(0, -height)
						this.ctx.drawImage(src, 0, 0, width, height)
						this.ctx.draw()
						uni.canvasToTempFilePath({
							canvasId: this.canvasId,
							quality: 1,
							success: res => {
								this.$emit('success', res.tempFilePath)
							},
							fail: err => {
								console.error(err)
								this.$emit('fail', err)
							}
						}, this)
					}, 200)
				})
			}
		}
	}
</script>


<style scoped>
	.my-canvas {
		overflow: hidden !important;
		position: fixed !important;
		z-index: -100000 !important;
		visibility: hidden !important;
		top: 400% !important;
		left: 400% !important;
	}
</style>

图片太大?

贴代码