fix

src/tool/domTurnImg.js

@@ -2,13 +2,14 @@ import html2canvas from "html2canvas";
 const getJpeg = dom =>{
 	return new Promise(resolve =>{
 		setTimeout(() => {
-			html2canvas(dom,{useCORS: true,}).then(canvas =>{
-				let base64 = canvas.toDataURL('image/jpeg',.9);
+			html2canvas(dom,{useCORS: true,backgroundColor: null}).then(canvas =>{
+				let base64 = canvas.toDataURL('image/png',.9);
+				console.log(base64)
 				// let quality = 0.9    // 压缩系数0-1之间
 				let newImage = new Image()
 				newImage.src = base64
 				newImage.setAttribute('crossOrigin', 'Anonymous') // url为外域时需要
-				const filename = new Date().toISOString() + '.jpg';
+				const filename = new Date().toISOString() + '.png';
 				resolve(base64ToFile(base64,filename))
 				newImage.remove()
 				// }
@@ -29,7 +30,7 @@ function base64ToFile(base64,filename) {
    const byteArray = new Uint8Array(byteNumbers);
    
    // 创建 File 对象
-   const file = new File([byteArray], filename, { type: 'image/jpeg' }); // 根据需要的类型进行修改
+   const file = new File([byteArray], filename, { type: 'image/png' }); // 根据需要的类型进行修改
    return file;
 }
 	//base64转成blob
@@ -39,7 +40,7 @@ function dataURLtoFile(dataURI, type) {
 	for (let i = 0; i < binary.length; i++) {
 		array.push(binary.charCodeAt(i));
 	}
-	return new Blob([new Uint8Array(array)], { type: "image/jpeg" });
+	return new Blob([new Uint8Array(array)], { type: "image/png" });
 }
 
 //转换