项目中实用的javascript封装方法

1、校验数据类型

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

示例：

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

2、防抖

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

示例：

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

3，节流

export const throttle = (() => {
  let last = 0
  return (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
  }
}

示例：

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
}

示例：

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

9、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) return
  let list = []
  const map = {}
  arr.forEach((item) => {
    if (!map[item[key]]) {
      map[item[key]] = item
    }
  })
  list = Object.values(map)

  return list
}

示例：

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' }]

10、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);
  }
}

11、滚动到元素位置

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

示例：

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

12、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 : +number
  const prec = !isFinite(+decimals) ? 2 : Math.abs(decimals)
  const sep = typeof thousands_sep === 'undefined' ? ',' : thousands_sep
  const dec = typeof dec_point === 'undefined' ? '.' : dec_point
  let 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)
}

示例：

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