base64转file上传

base64图片转file上传

base64ToFile(dataurl, filename) {
    const arr = dataurl.split(',')
    const mime = arr[0].match(/:(.*?);/)[1]
    const bstr = atob(arr[1])
    let n = bstr.length
    const u8arr = new Uint8Array(n)

    while (n--) {
        u8arr[n] = bstr.charCodeAt(n)
    }
    return new File([u8arr], filename, { type: mime })
}