ljw
70 lignes
1.7 KiB
JavaScript
70 lignes
1.7 KiB
JavaScript
export function get_suffix (filename) {
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var pos = filename.lastIndexOf('.')
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var suffix = ''
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if (pos !== -1) {
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suffix = filename.substring(pos)
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}
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return suffix
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}
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export function random_string (len) {
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len = len || 32
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var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'
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var maxPos = chars.length
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var pwd = ''
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for (let i = 0; i < len; i++) {
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pwd += chars.charAt(Math.floor(Math.random() * maxPos))
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}
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return pwd
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}
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export function random_filename (filename) {
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var suffix = get_suffix(filename)
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var time = new Date()
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var time2 = new Date('2020/01/01')
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return Math.ceil((time.getTime() - time2.getTime()) / 1000) + '_' + random_string(10) + suffix
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}
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export function utf8_to_b64 (str) {
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return window.btoa(unescape(encodeURIComponent(str)))
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}
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export function b64_to_utf8 (str) {
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return decodeURIComponent(escape(window.atob(str)))
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}
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export function jsonToCsv (data) {
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let csv = ''
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let keys = Object.keys(data[0])
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csv += keys.join(',') + '\n'
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data.forEach(row => {
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csv += keys.map(key => `"${row[key]}"`).join(',') + '\n'
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})
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return new Blob([csv], { type: 'text/csv' })
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}
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export function downBlob (blob, filename) {
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const url = window.URL.createObjectURL(blob)
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const a = document.createElement('a')
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a.href = url
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a.download = filename
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document.body.appendChild(a)
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a.click()
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setTimeout(() => {
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window.URL.revokeObjectURL(url)
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document.body.removeChild(a)
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})
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}
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export function sizeFormat (size) {
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if (size < 1024) {
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return size + 'B'
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} else if (size < 1024 * 1024) {
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return (size / 1024).toFixed(2) + 'KB'
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} else if (size < 1024 * 1024 * 1024) {
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return (size / 1024 / 1024).toFixed(2) + 'MB'
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} else {
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return (size / 1024 / 1024 / 1024).toFixed(2) + 'GB'
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}
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}
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