微信小程序中将图片截图为正方形（自动居中）

没啥可说的，直接看代码吧（邪恶的微信小程序和浏览器的还不一样）

//将用户图片自动剪切成正方形
const cutImgToSquare = (imgPath: string) => {
    //@ts-ignore
    wx.createSelectorQuery()
        .select('#canvas')
        .fields({ node: true, size: true })
        .exec((res: any) => {
            const canvas = res[0].node
            const ctx = canvas.getContext('2d')
            const image = canvas.createImage()
            image.onload = () => {
                const size = Math.min(image.width, image.height)
                canvas.width = size
                canvas.height = size
                ctx.clearRect(0, 0, canvas.width, canvas.height)
                ctx.drawImage(image, (image.width - size) / 2, (image.height - size) / 2, size, size, 0, 0, size, size)
                //@ts-ignore
                wx.canvasToTempFilePath({
                    canvas,
                    success: (res: any) => {
                        console.log("调用成功", res)
                    },
                    fail: (err: any) => {
                        console.log("调用失败", err)
                        loading.value = false
                        uni.showToast({
                            title: '图片上传失败！',
                            icon: 'error'
                        })
                    },
                    complete: (res: any) => {
                        console.log("调用完成", res)
                    }
                })
            }
            image.src = imgPath
        })
}

这里在wx.canvasToTempFilePath中的success中的返回值就是截取后的图片临时地址