/**
* 解析base64中的数据信息
* @param {String} base64
* @returns
*/
function parseBase64(base64) {
let arr = base64.split(',')
let mime = arr[0].match(/:(.*?);/)[1]
return {
mime,
data: arr[1]
}
}
/**
* base64转Uint8
* @param {String} base64
* @returns
*/
function base64ToUint8Array(base64) {
let parsedBase64 = parseBase64(base64)
let bstr = atob(parsedBase64.data)
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return u8arr
}
/**
* file 转Base64 DataURL
* @param {File} file
* @returns
*/
function fileToBase64Async(file) {
return new Promise((resolve, reject) => {
let reader = new FileReader()
reader.readAsDataURL(file)
reader.onload = (e) => {
resolve(e.target.result)
}
})
}
/**
* 将base64转换为blob
* @param {String} base64
* @returns
*/
function base64ToBlob(base64) {
let parsedBase64 = parseBase64(base64)
let u8arr = base64ToUint8Array(base64)
return new Blob([u8arr], { type: parsedBase64.mime })
}
/**
* base64 转 File
* @param {String} base64
* @returns
*/
function base64ToFile(base64) {
let file = null
// 浏览器兼容
if (window.File != undefined) {
let parsedBase64 = parseBase64(base64)
let u8arr = base64ToUint8Array(base64)
file = new File([u8arr], parsedBase64.mime.replace('/', '.'), {
type: parsedBase64.mime
})
} else {
file = blobToFile(base64ToBlob(base64))
}
return file
},
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