You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.3 KiB
84 lines
2.3 KiB
# 常用工具类
|
|
|
|
## 日期格式化
|
|
```js
|
|
import {timeFormat} from '@/utils'
|
|
|
|
// 以 yyyy-MM-dd HH:mm:ss 格式显示的当前时间
|
|
timeFormat()
|
|
|
|
// 06-29
|
|
timeFormat('MM-dd',new Date('2020/06/29'))
|
|
```
|
|
|
|
## 数学运算
|
|
|
|
基于 `decimal.js` 封装了加减乘除运算方法。
|
|
|
|
```js
|
|
import {plus,sub,mul,div} from '@/utils/math'
|
|
|
|
//1.05 * 10.8 / 0.6 /0.1 + 0.1 + 0.5 - 0.2 - 0.3
|
|
sub(plus(div(mul(1.05,10.8),0.6,0.1),0.1,0.5),0.2,0.3)
|
|
```
|
|
|
|
## 列表转树
|
|
|
|
```js
|
|
import {createTree} from '@/utils/tree'
|
|
|
|
const arr1 = [{id: 1, pid: 0, name: 'a'}, {id: 2, pid: 1, name: 'b'}, {id: 3, pid:2, name: 'c'}]
|
|
const tree1 = createTree(arr1)
|
|
|
|
const arr2 = [{xid: 1, ypid: 0, name: 'a'}, {xid: 2, ypid: 1, name: 'b'}, {xid: 3, ypid: 2, name:' c'}]
|
|
const tree2 = createTree(arr2, 0, 'xid', 'ypid')
|
|
```
|
|
|
|
## 纯前端导出excel
|
|
|
|
依赖exceljs（实际上项目中还有xlsx-style的实现版本，见 `@/utils/excel/xlsx`，不过存在问题，所以弃用了）。
|
|
```js
|
|
import {json2workbook, exportExcelByJs} from '@/utils/excel'
|
|
|
|
const column = [
|
|
{header: ['合并表头演示', '序号'], prop: 'no', merge: true},
|
|
{header: ['合并表头演示', '名称'], prop: 'name', merge: true},
|
|
{header: '日期', prop: 'date'}
|
|
]
|
|
|
|
const arr = [
|
|
{no: 1,name: '老王',date: '20190201'}
|
|
]
|
|
|
|
const workbook = json2workbook(arr, column)
|
|
|
|
exportExcelByJs(workbook, '测试导出.xlsx')
|
|
```
|
|
|
|
### json2workbook(data, columns, merge) : workbook
|
|
|
|
- `data` : `array`，json数组。
|
|
|
|
- `columns` : `array`，列配置项数组，列配置详细如下：
|
|
```js
|
|
{
|
|
header : string | array，表头名称，类型为 array 时，将从左往右地解析成一颗树，用于表头的合并
|
|
prop : string，表头对应的 json 字段名称，如果为空，则该字段不会写入excel表格
|
|
merge : boolean，是否需要合并，true的话会从上至下合并值相同的相邻单元格
|
|
width : number，单元格宽度，默认 20
|
|
}
|
|
```
|
|
|
|
- `merge` : `object`，合并配置项，详细如下：
|
|
```js
|
|
{
|
|
primaryKey : string，每行json数据的唯一标识字段名称
|
|
orderKey : string，每行json数据的序号字段名称
|
|
}
|
|
```
|
|
|
|
### exportExcelByJs(workbook, filename)
|
|
|
|
- `workbook`，json2workbook的返回结果
|
|
|
|
- `filename` : `string`，导出的文件名称，需要带上.xlsx后缀
|
|
|