前言

日常开发中，面对各种不同的需求，我们经常会用到以前开发过的一些工具函数，把这些工具函数收集起来，将大大提高我们的开发效率。

1、校验数据类型

export const typeOf = function(obj) {return Object.prototype.toString.call(obj).slice(8, -1).toLowerCase()
}

typeOf('树哥')  // string
typeOf([])  // array
typeOf(new Date())  // date
typeOf(null) // null
typeOf(undefined) // undefined
typeOf(true) // boolean
typeOf(() => { }) // function

2、防抖

export const debounce = (() => {let timer = nullreturn (callback, wait = 800) => {timer&&clearTimeout(timer)timer = setTimeout(callback, wait)}
})()

methods: {loadList() {debounce(() => {console.log('加载数据')}, 500)}
}

3、节流

export const throttle = (() => {let last = 0return (callback, wait = 800) => {let now = +new Date()if (now - last > wait) {callback()last = now}}
})()

4、手机号脱敏

export const hideMobile = (mobile) => {return mobile.replace(/^(\d{3})\d{4}(\d{4})$/, "$1****$2")
}

5、开启全屏

export const launchFullscreen = (element) => {if (element.requestFullscreen) {element.requestFullscreen()} else if (element.mozRequestFullScreen) {element.mozRequestFullScreen()} else if (element.msRequestFullscreen) {element.msRequestFullscreen()} else if (element.webkitRequestFullscreen) {element.webkitRequestFullScreen()}
}

6、关闭全屏

export const exitFullscreen = () => {if (document.exitFullscreen) {document.exitFullscreen()} else if (document.msExitFullscreen) {document.msExitFullscreen()} else if (document.mozCancelFullScreen) {document.mozCancelFullScreen()} else if (document.webkitExitFullscreen) {document.webkitExitFullscreen()}
}

7、大小写转换

参数：

• str 待转换的字符串
• type 1-全大写 2-全小写 3-首字母大写

export const turnCase = (str, type) => {switch (type) {case 1:return str.toUpperCase()case 2:return str.toLowerCase()case 3://return str[0].toUpperCase() + str.substr(1).toLowerCase() // substr 已不推荐使用return str[0].toUpperCase() + str.substring(1).toLowerCase()default:return str}
}

turnCase('vue', 1) // VUE
turnCase('REACT', 2) // react
turnCase('vue', 3) // Vue

8、解析URL参数

export const getSearchParams = () => {const searchPar = new URLSearchParams(window.location.search)const paramsObj = {}for (const [key, value] of searchPar.entries()) {paramsObj[key] = value}return paramsObj
}

// 假设目前位于 https://****com/index?id=154513&age=18;
getSearchParams(); // {id: "154513", age: "18"}

9、判断手机是Andoird还是IOS

/** * 1: ios* 2: android* 3: 其它*/
export const getOSType=() => {let u = navigator.userAgent, app = navigator.appVersion;let isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1;let isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);if (isIOS) {return 1;}if (isAndroid) {return 2;}return 3;
}

10、数组对象根据字段去重

参数：

• arr 要去重的数组
• key 根据去重的字段名

export const uniqueArrayObject = (arr = [], key = 'id') => {if (arr.length === 0) returnlet list = []const map = {}arr.forEach((item) => {if (!map[item[key]]) {map[item[key]] = item}})list = Object.values(map)return list
}

const responseList = [{ id: 1, name: '树哥' },{ id: 2, name: '黄老爷' },{ id: 3, name: '张麻子' },{ id: 1, name: '黄老爷' },{ id: 2, name: '张麻子' },{ id: 3, name: '树哥' },{ id: 1, name: '树哥' },{ id: 2, name: '黄老爷' },{ id: 3, name: '张麻子' },
]uniqueArrayObject(responseList, 'id')
// [{ id: 1, name: '树哥' },{ id: 2, name: '黄老爷' },{ id: 3, name: '张麻子' }]

11、滚动到页面顶部

export const scrollToTop = () => {const height = document.documentElement.scrollTop || document.body.scrollTop;if (height > 0) {window.requestAnimationFrame(scrollToTop);window.scrollTo(0, height - height / 8);}
}

12、滚动到元素位置

export const smoothScroll = element =>{document.querySelector(element).scrollIntoView({behavior: 'smooth'});
};

smoothScroll('#target'); // 平滑滚动到 ID 为 target 的元素

13、uuid

export const uuid = () => {const temp_url = URL.createObjectURL(new Blob())const uuid = temp_url.toString()URL.revokeObjectURL(temp_url) //释放这个urlreturn uuid.substring(uuid.lastIndexOf('/') + 1)
}

uuid() // a640be34-689f-4b98-be77-e3972f9bffdd

uuid一般应由后端来进行生成

14、金额格式化

参数：

• {number} number：要格式化的数字
• {number} decimals：保留几位小数
• {string} dec_point：小数点符号
• {string} thousands_sep：千分位符号

export const moneyFormat = (number, decimals, dec_point, thousands_sep) => {number = (number + '').replace(/[^0-9+-Ee.]/g, '')const n = !isFinite(+number) ? 0 : +numberconst prec = !isFinite(+decimals) ? 2 : Math.abs(decimals)const sep = typeof thousands_sep === 'undefined' ? ',' : thousands_sepconst dec = typeof dec_point === 'undefined' ? '.' : dec_pointlet s = ''const toFixedFix = function(n, prec) {const k = Math.pow(10, prec)return '' + Math.ceil(n * k) / k}s = (prec ? toFixedFix(n, prec) : '' + Math.round(n)).split('.')const re = /(-?\d+)(\d{3})/while (re.test(s[0])) {s[0] = s[0].replace(re, '$1' + sep + '$2')}if ((s[1] || '').length < prec) {s[1] = s[1] || ''s[1] += new Array(prec - s[1].length + 1).join('0')}return s.join(dec)
}

moneyFormat(10000000) // 10,000,000.00
moneyFormat(10000000, 3, '.', '-') // 10-000-000.000

15、存储操作

class MyCache {constructor(isLocal = true) {this.storage = isLocal ? localStorage : sessionStorage}setItem(key, value) {if (typeof (value) === 'object') value = JSON.stringify(value)this.storage.setItem(key, value)}getItem(key) {try {return JSON.parse(this.storage.getItem(key))} catch (err) {return this.storage.getItem(key)}}removeItem(key) {this.storage.removeItem(key)}clear() {this.storage.clear()}key(index) {return this.storage.key(index)}length() {return this.storage.length}
}const localCache = new MyCache()
const sessionCache = new MyCache(false)export { localCache, sessionCache }

localCache.getItem('user')
sessionCache.setItem('name','树哥')
sessionCache.getItem('token')
localCache.clear()

16、下载文件

参数：

• api 接口
• params 请求参数
• fileName 文件名

const downloadFile = (api, params, fileName, type = 'get') => {axios({method: type,url: api,responseType: 'blob', params: params}).then((res) => {let str = res.headers['content-disposition']if (!res || !str) {return}let suffix = ''// 截取文件名和文件类型if (str.lastIndexOf('.')) {fileName ? '' : fileName = decodeURI(str.substring(str.indexOf('=') + 1, str.lastIndexOf('.')))suffix = str.substring(str.lastIndexOf('.'), str.length)}//  如果支持微软的文件下载方式(ie10+浏览器)if (window.navigator.msSaveBlob) {try {const blobObject = new Blob([res.data]);window.navigator.msSaveBlob(blobObject, fileName + suffix);} catch (e) {console.log(e);}} else {//  其他浏览器let url = window.URL.createObjectURL(res.data)let link = document.createElement('a')link.style.display = 'none'link.href = urllink.setAttribute('download', fileName + suffix)document.body.appendChild(link)link.click()document.body.removeChild(link)window.URL.revokeObjectURL(link.href);}}).catch((err) => {console.log(err.message);})
}`

downloadFile('/api/download', {id}, '文件名')

17、模糊搜索

参数：

• list 原数组
• keyWord 查询的关键词
• attribute 数组需要检索属性

export const fuzzyQuery = (list, keyWord, attribute = 'name') => {const reg = new RegExp(keyWord)const arr = []for (let i = 0; i < list.length; i++) {if (reg.test(list[i][attribute])) {arr.push(list[i])}}return arr
}

const list = [{ id: 1, name: '树哥' },{ id: 2, name: '黄老爷' },{ id: 3, name: '张麻子' },{ id: 4, name: '汤师爷' },{ id: 5, name: '胡万' },{ id: 6, name: '花姐' },{ id: 7, name: '小梅' }
]
fuzzyQuery(list, '树', 'name') // [{id: 1, name: '树哥'}]

18、遍历树节点

export const foreachTree = (data, callback, childrenName = 'children') => {for (let i = 0; i < data.length; i++) {callback(data[i])if (data[i][childrenName] && data[i][childrenName].length > 0) {foreachTree(data[i][childrenName], callback, childrenName)}}
}

假设我们要从树状结构数据中查找 id 为 9 的节点

const treeData = [{id: 1,label: '一级 1',children: [{id: 4,label: '二级 1-1',children: [{id: 9,label: '三级 1-1-1'}, {id: 10,label: '三级 1-1-2'}]}]}, {id: 2,label: '一级 2',children: [{id: 5,label: '二级 2-1'}, {id: 6,label: '二级 2-2'}]}, {id: 3,label: '一级 3',children: [{id: 7,label: '二级 3-1'}, {id: 8,label: '二级 3-2'}]
}],let result
foreachTree(data, (item) => {if (item.id === 9) {result = item}
})
console.log('result', result)  // {id: 9,label: "三级 1-1-1"}