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80 lines
2.6 KiB
80 lines
2.6 KiB
# 常用工具类
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## 日期格式化
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```js
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import {timeFormat} from '@/utils'
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// 以 yyyy-MM-dd HH:mm:ss 格式显示的当前时间
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timeFormat()
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// 06-29
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timeFormat('MM-dd',new Date('2020/06/29'))
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```
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## 数学运算
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基于 `decimal.js` 封装了加减乘除运算方法。
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```js
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import {plus,sub,mul,div} from '@/utils/math'
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//1.05 * 10.8 / 0.6 /0.1 + 0.1 + 0.5 - 0.2 - 0.3
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sub(plus(div(mul(1.05,10.8),0.6,0.1),0.1,0.5),0.2,0.3)
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```
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## 列表转树
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```js
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import {createTree} from '@/utils/tree'
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const arr1 = [{id: 1, pid: 0, name: 'a'}, {id: 2, pid: 1, name: 'b'}, {id: 3, pid:2, name: 'c'}]
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const tree1 = createTree(arr1)
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const arr2 = [{xid: 1, ypid: 0, name: 'a'}, {xid: 2, ypid: 1, name: 'b'}, {xid: 3, ypid: 2, name:' c'}]
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const tree2 = createTree(arr2, 0, 'xid', 'ypid')
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```
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## 纯前端导出excel
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依赖exceljs，项目中使用script引入。
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```js
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import {json2workbook, workbook2excel} from '@/utils/excel'
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const column = [
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{header: ['合并表头演示', '序号'], prop: 'no', merge: true},
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{header: '合并表头演示-名称', prop: 'name', merge: true},
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{header: '日期', prop: 'date'}
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]
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const arr = [
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{no: 1,name: '老王',date: '20190201'}
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]
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const workbook = json2workbook(arr, column)
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workbook2excel(workbook, '测试导出.xlsx')
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```
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### json2workbook(data, columns, merge) : workbook
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- `data` : `array`，json数组。
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- `columns` : `array`，列配置项数组，列配置详细如下：
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| 参数 | 说明 | 类型 | 默认 |
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| :----: | :-----------------------------------------------------------: | :------------: | :--: |
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| header | 表头名称，通过使用'-'分隔符或者传入array来实现多级表头 | `string|array` | - |
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| prop | 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 | `string` | - |
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| merge | 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 | `boolean` | - |
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| width | 单元格宽度 | `number` | 20 |
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- `merge` : `object`，合并配置项，详细如下：
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| 参数 | 说明 | 类型 | 默认 |
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| :--------: | :----------------------------: | :------: | :--: |
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| primaryKey | 每行json数据的唯一标识字段名称 | `string` | - |
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| orderKey | 每行json数据的序号字段名称 | `string` | - |
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### workbook2excel(workbook, filename)
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- `workbook`，exceljs的workbook对象
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- `filename` : `string`，导出的文件名称，需要带上.xlsx后缀
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