@huntianning/components
Version:
Custom components for HTN
57 lines (54 loc) • 1.8 kB
JavaScript
let number = Date.now()
export function unique(prefix = '') {
++number
return `${prefix}${number}`
}
export function isEmpty(val) {
return val === undefined || val === null || val === ''
}
/**
* 将一个sheet转成最终的excel文件的blob对象，然后利用URL.createObjectURL下载
*/
export function sheet2blob(xlsx, sheet, sheetName) {
sheetName = sheetName || 'sheet1'
const workbook = {
SheetNames: [sheetName],
Sheets: {}
}
workbook.Sheets[sheetName] = sheet // 生成excel的配置项
const wopts = {
bookType: 'xlsx', // 要生成的文件类型
bookSST: false, // 是否生成Shared String Table，官方解释是，如果开启生成速度会下降，但在低版本IOS设备上有更好的兼容性
type: 'binary'
}
const wbout = xlsx.write(workbook, wopts)
const blob = new Blob([s2ab(wbout)], {
type: 'application/octet-stream'
})
// 字符串转ArrayBuffer
function s2ab(s) {
const buf = new ArrayBuffer(s.length)
const view = new Uint8Array(buf)
for (let i = 0; i !== s.length; ++i) {
view[i] = s.charCodeAt(i) & 0xFF
}
return buf
}
return blob
}
export function openDownloadDialog(url, saveName) {
if (typeof url === 'object' && url instanceof Blob) {
url = URL.createObjectURL(url) // 创建blob地址
}
const aLink = document.createElement('a')
aLink.href = url
aLink.download = saveName || '' // HTML5新增的属性，指定保存文件名，可以不要后缀，注意，file:///模式下不会生效
let event
if (window.MouseEvent) {
event = new MouseEvent('click')
} else {
event = document.createEvent('MouseEvents')
event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)
}
aLink.dispatchEvent(event)
}