export?default?class?FileTools?{
????/**
?????*?@method?fileSizeFormat????格式化文件大小文本
?????*?@param?{number}?fileSize??要格式化的文本大小，單位為Byte
?????*?@param?{number}?precision?取小數(shù)點(diǎn)后幾位，默認(rèn)2位
?????*?@param?{string[]}?units???要格式化的單位文本，順序?yàn)閺男〉酱螅?默認(rèn)為['B',?'KB',?'MB',?'GB',?'TB',?'PB']
?????*?@return?{string}??????????返回格式化后的文件大小字符串
?????*/
????static?fileSizeFormat(fileSize,?precision?=?2,?units?=?['B',?'KB',?'MB',?'GB',?'TB',?'PB'])?{
????????let?p?=?0
????????while?(fileSize?>=?1024?&&?p?<?units.length)?{
????????????fileSize?=?fileSize?/?1024
????????????p++
????????}
????????return?fileSize.toFixed(precision)?+?units[p]
????}
????/***
?????*?@method?fileToBase64????????文件對(duì)象轉(zhuǎn)base64(異步)
?????*?@param?{File}?file??????????要解析的文件對(duì)象
?????*?@param?{function}?callback??解析成功的回調(diào)函數(shù)
?????*?@param?{function}?callerror?解析失敗的回調(diào)函數(shù)
?????*/
????static?fileToBase64(file,?callback,?callerror)?{
????????const?fileReader?=?new?FileReader()
????????fileReader.readAsDataURL(file)
????????fileReader.onload?=?(e)?=>?{
????????????const?[base64Str,?base64Length]?=?[e.target.result,?e.target.result.length]
????????????const?result?=?{
????????????????base64:?base64Str,
????????????????base64Size:?base64Length,
????????????????base64FormatSize:?this.fileSizeFormat(base64Length),
????????????????name:?file.name,
????????????????lastModified:?file.lastModified,
????????????????size:?file.size,
????????????????formatSize:?this.fileSizeFormat(file.size),
????????????????type:?file.type,
????????????}
????????????if?(callback)?callback(result)
????????}
????????fileReader.onerror?=?(e)?=>?{
????????????fileReader.abort()
????????????if?(callerror)?callerror(e)
????????}
????}
????/***
?????*?@method?fileToBase64?文件對(duì)象轉(zhuǎn)base64?Promise版
?????*?@param??{File}?file?要解析的文件對(duì)象
?????*?@return?{Promise}?返回一個(gè)Promise對(duì)象，可鏈?zhǔn)秸{(diào)用then和catch
?????*/
????static?fileToBase64Promise(file)?{
????????return?new?Promise((resolve,?reject)?=>?{
????????????this.fileToBase64(
????????????????file,
????????????????(result)?=>?{
????????????????????resolve(result)
????????????????},
????????????????(error)?=>?{
????????????????????reject(error)
????????????????}
????????????)
????????})
????}
????/***
?????*?@method?fileToBase64List??????????文件列表轉(zhuǎn)base64(異步)
?????*?@param?{FileList|File[]}?files????要解析的文件對(duì)象列表，類型應(yīng)為FileList對(duì)象或元素為Flie對(duì)象的數(shù)組
?????*?@param?{function}?callback????????解析成功的回調(diào)函數(shù)
?????*?@param?{function}?callerror???????解析失敗的回調(diào)函數(shù)
?????*/
????static?fileToBase64List(files,?callback,?callerror)?{
????????const?promiseList?=?[]
????????for?(let?i?=?0;?i?<?files.length;?i++)?{
????????????promiseList.push(this.fileToBase64Promise(files[i]))
????????}
????????Promise.all(promiseList)
????????????.then((result)?=>?{
????????????????if?(callback)?callback(result)
????????????})
????????????.catch((error)?=>?{
????????????????if?(callerror)?callerror(error)
????????????})
????}
????/***
?????*?@method?fileToBase64ListPromise???文件列表轉(zhuǎn)base64?Promise版(異步)
?????*?@param?{FileList|File[]}?files????要解析的文件對(duì)象列表，類型應(yīng)為FileList對(duì)象或元素為Flie對(duì)象的數(shù)組
?????*?@param?{function}?callback????????解析成功的回調(diào)函數(shù)
?????*?@param?{function}?callerror???????解析失敗的回調(diào)函數(shù)
?????*/
????static?fileToBase64ListPromise(files)?{
????????return?new?Promise((resolve,?reject)?=>?{
????????????this.fileToBase64List(files,?(result)?=>?{
????????????????resolve(result)
????????????},?(error)?=>?{
????????????????reject(error)
????????????})
????????})
????}
????/**
?????*?@method?base64ToFile????????base64字符串轉(zhuǎn)文件并拉起下載
?????*?@param?{string}?base64Data??要轉(zhuǎn)換的文件內(nèi)容的base64字符串
?????*?@param?{string}?fileName????轉(zhuǎn)換后的文件名
?????*/
????static?base64ToFile(base64Data,?fileName)?{
????????const?eleLink?=?document.createElement('a')
????????eleLink.download?=?fileName
????????eleLink.style.display?=?'none'
????????eleLink.href?=?base64Data
????????document.body.appendChild(eleLink)
????????eleLink.click()
????????document.body.removeChild(eleLink)
????}
????//?arraybuffer類型轉(zhuǎn)16進(jìn)制字符串
????static?ab2str(buf)?{
????????return?Array.prototype.map
????????????.call(new?Uint8Array(buf),?(x)?=>?("00"?+?x.toString(16)).slice(-2))
????????????.join("");
????}
????//16進(jìn)制字符串?轉(zhuǎn)?ArrayBuffer
????static?str2ab(str)?{
????????let?typedArray?=?new?Uint8Array(
????????????str.match(/[\da-f]{2}/gi).map(function?(h)?{
????????????????return?parseInt(h,?16);
????????????})
????????);
????????return?typedArray.buffer
????}
????/***
?????*?@method?fileToString????????文件對(duì)象轉(zhuǎn)String(異步)
?????*?@param?{File}?file??????????要解析的文件對(duì)象
?????*?@param?{function}?callback??解析成功的回調(diào)函數(shù)
?????*?@param?{function}?callerror?解析失敗的回調(diào)函數(shù)
?????*/
????static?fileToString(file,?callback,?callerror)?{
????????const?fileReader?=?new?FileReader()
????????fileReader.onload?=?(e)?=>?{
????????????let?fileString?=?''
????????????this.abToStr(e.target.result,?(str)?=>?{
????????????????fileString?=?str
????????????})
????????????const?result?=?{
????????????????fileString,
????????????????name:?file.name,
????????????????size:?file.size,
????????????????type:?file.type,
????????????}
????????????if?(callback)?callback(result)
????????}
????????fileReader.onerror?=?(e)?=>?{
????????????if?(callerror)?callerror(e)
????????}
????????readIcon.readAsArrayBuffer(files[i]);
????}
????/***
?????*?@method?fileToStringPromise?文件對(duì)象轉(zhuǎn)String?Promise版
?????*?@param??{File}?file?要解析的文件對(duì)象
?????*?@return?{Promise}?返回一個(gè)Promise對(duì)象，可鏈?zhǔn)秸{(diào)用then和catch
?????*/
????static?fileToStringPromise(file)?{
????????return?new?Promise((resolve,?reject)?=>?{
????????????this.fileToString(
????????????????file,
????????????????(result)?=>?{
????????????????????resolve(result)
????????????????},
????????????????(error)?=>?{
????????????????????reject(error)
????????????????}
????????????)
????????})
????}
????/***
?????*?@method?fileToStringList??????????文件列表轉(zhuǎn)String(異步)
?????*?@param?{FileList|File[]}?files????要解析的文件對(duì)象列表，類型應(yīng)為FileList對(duì)象或元素為Flie對(duì)象的數(shù)組
?????*?@param?{function}?callback????????解析成功的回調(diào)函數(shù)
?????*?@param?{function}?callerror???????解析失敗的回調(diào)函數(shù)
?????*/
????static?fileToStringList(files,?callback,?callerror)?{
????????const?promiseList?=?[]
????????for?(let?i?=?0;?i?<?files.length;?i++)?{
????????????promiseList.push(this.fileToStringPromise(files[i]))
????????}
????????Promise.all(promiseList)
????????????.then((result)?=>?{
????????????????if?(callback)?callback(result)
????????????})
????????????.catch((error)?=>?{
????????????????if?(callerror)?callerror(error)
????????????})
????}
????/***
?????*?@method?fileToStringListPromise???文件列表轉(zhuǎn)String?Promise版(異步)
?????*?@param?{FileList|File[]}?files????要解析的文件對(duì)象列表，類型應(yīng)為FileList對(duì)象或元素為Flie對(duì)象的數(shù)組
?????*?@param?{function}?callback????????解析成功的回調(diào)函數(shù)
?????*?@param?{function}?callerror???????解析失敗的回調(diào)函數(shù)
?????*/
????static?fileToStringListPromise(files)?{
????????return?new?Promise((resolve,?reject)?=>?{
????????????this.fileToStringList(files,?(result)?=>?{
????????????????resolve(result)
????????????},?(error)?=>?{
????????????????reject(error)
????????????})
????????})
????}
????/**
?????*?@method?funDownload????????字符串轉(zhuǎn)文件并拉起下載
?????*?@param?{string}?content??要轉(zhuǎn)換的文件內(nèi)容的字符串
?????*?@param?{string}?fileName????轉(zhuǎn)換后的文件名
?????*/
????static?funDownload(content,?filename)?{
????????const?eleLink?=?document.createElement("a");
????????eleLink.download?=?filename;
????????eleLink.style.display?=?"none";
????????const?blob?=?new?Blob([content]);
????????eleLink.href?=?URL.createObjectURL(blob);
????????document.body.appendChild(eleLink);
????????eleLink.click();
????????document.body.removeChild(eleLink);
????}
}
