vue base64图片转file流 下载到本地 或者上传

<img  :src="'data:image/png;base64,'+form.img" style="max-width:280px;max-height: 280px;margin: auto;" />

// base64 转file
const base64ToFile=()=>{let byImg= atob(form.img); // 解码base64let n = byImg.lengthlet a = new Uint8Array(n);while (n--) {a[n] = byImg.charCodeAt(n);}const options = {type: 'image/png',endings: 'native',}let nameImg = '图片名称';return new File([a], nameImg+'.png', options);
}
//上传图片
const confirmImg =()=>{let nameImg = '图片名称';const imgFile = base64ToFile();let formData = new FormData();formData.append("file_name", imgFile);formData.append('type',3);formData.append('mark_name',nameImg+'.png');formData.append('name',nameImg);formData.append('tag',tag);//省略提交return true;});
}// 下载到本地
const downloadImg=()=>{const imgFile = base64ToFile();let nameImg = '图片名称';let imgDown= document.createElement('a');imgDown.download = nameImg;imgDown.href = URL.createObjectURL(imgFile);imgDown.click();
}