js File文件转换为二进制格式和base64转换为图片

// 图片转换为base64imageToBase64(img) {return new Promise((resolve) => {let reader = new FileReader();reader.readAsDataURL(img); //转化二进制流，异步方法reader.onload = (e) => {// console.log(e.target.result,'-----res')resolve(e.target.result) ;};});},// base64转为图片base64ToBlob(urlData, type = "image/png") {return `data:${type};base64,${urlData}`;},