// 压缩上传图片
export function translate(imgSrc, scale, fileName, callback) {
	let scales = parseFloat(scale.toFixed(2))
	let img = new Image();
	img.src = imgSrc;
	img.onload = function() {
		let canvas = document.createElement('canvas') // 创建Canvas对象(画布)
		const context = canvas.getContext('2d')
		// 默认按比例压缩
		// let cw = img.width
		// let ch = img.height
		let w = img.width
		let h = img.height
		canvas.width = w
		canvas.height = h
		// if (cw > 600 && cw > ch) {
		// 	w = 600
		// 	h = (600 * ch) / cw
		// 	canvas.width = w
		// 	canvas.height = h
		// }
		// if (ch > 600 && ch > cw) {
		// 	h = 600
		// 	w = (600 * cw) / ch
		// 	canvas.width = w
		// 	canvas.height = h
		// }
		// 生成canvas
		context.clearRect(0, 0, 0, w, h)
		context.drawImage(img, 0, 0, w, h)
		let dataurl = canvas.toDataURL('image/jpeg', scales); //压缩比例
		let arr = dataurl.split(',')
		// console.log(arr, dataurl, 'translate')sss
		let mime = arr[0].match(/:(.*?);/)[1]
		let bstr = atob(arr[1])
		let n = bstr.length
		let u8arr = new Uint8Array(n);
		while (n--) {
			u8arr[n] = bstr.charCodeAt(n);
		}
		let file = new File([u8arr], fileName, {
			type: mime
		});
		// file.lastModifiedDate = new Date();
		canvas = null;
		callback && callback(dataurl, file);
	}
}