工具函数

Created At :
Views 👀 :
  1. 1、校验数据类型
  2. 2、防抖
  3. 3、节流
  4. 4、手机号脱敏
  5. 5、开启全屏
  6. 6、关闭全屏
  7. 7、大小写转换
  8. 8、解析URL参数
  9. 9、判断手机是Andoird还是IOS
  10. 10、数组对象根据字段去重
  11. 11、滚动到页面顶部
  12. 12、滚动到元素位置
  13. 13、金额格式化
  14. 14、存储操作
  15. 15、下载文件
  16. 16、深拷贝
  17. 17、模糊搜索
  18. 18、遍历树节点
  19. 19、停止冒泡事件

1、校验数据类型

1
2
3
4
5
6
7
8
9
10
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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
export const debounce = (() => {
  let timer = null
  return (callback, wait = 800) => {
    timer&&clearTimeout(timer)
    timer = setTimeout(callback, wait)
  }
})()
// 示例
methods: {
  loadList() {
    debounce(() => {
      console.log('加载数据')
    }, 500)
  }
}

3、节流

1
2
3
4
5
6
7
8
9
10
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

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

5、开启全屏

1
2
3
4
5
6
7
8
9
10
11
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

1
2
3
4
5
6
7
8
9
10
11
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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
// 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
  }
}

8、解析URL参数

1
2
3
4
5
6
7
8
9
10
11
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
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
/** 
 * 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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
// 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
}

11、滚动到页面顶部

1
2
3
4
5
6
7
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

1
2
3
4
5
export const smoothScroll = element =>{
    document.querySelector(element).scrollIntoView({
        behavior: 'smooth'
    });
};

13、金额格式化

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
// {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)
}

14、存储操作

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
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 }

15、下载文件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
//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 = url
      link.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);
  })
}


16、深拷贝

此方法存在一定局限性：一些特殊情况没有处理: 例如Buffer对象、Promise、Set、Map。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
export const clone = parent => {
  // 判断类型
  const isType = (obj, type) => {
    if (typeof obj !== "object") return false;
    const typeString = Object.prototype.toString.call(obj);
    let flag;
    switch (type) {
      case "Array":
        flag = typeString === "[object Array]";
        break;
      case "Date":
        flag = typeString === "[object Date]";
        break;
      case "RegExp":
        flag = typeString === "[object RegExp]";
        break;
      default:
        flag = false;
    }
    return flag;
  };

  // 处理正则
  const getRegExp = re => {
    var flags = "";
    if (re.global) flags += "g";
    if (re.ignoreCase) flags += "i";
    if (re.multiline) flags += "m";
    return flags;
  };
  // 维护两个储存循环引用的数组
  const parents = [];
  const children = [];

  const _clone = parent => {
    if (parent === null) return null;
    if (typeof parent !== "object") return parent;

    let child, proto;

    if (isType(parent, "Array")) {
      // 对数组做特殊处理
      child = [];
    } else if (isType(parent, "RegExp")) {
      // 对正则对象做特殊处理
      child = new RegExp(parent.source, getRegExp(parent));
      if (parent.lastIndex) child.lastIndex = parent.lastIndex;
    } else if (isType(parent, "Date")) {
      // 对Date对象做特殊处理
      child = new Date(parent.getTime());
    } else {
      // 处理对象原型
      proto = Object.getPrototypeOf(parent);
      // 利用Object.create切断原型链
      child = Object.create(proto);
    }

    // 处理循环引用
    const index = parents.indexOf(parent);

    if (index != -1) {
      // 如果父数组存在本对象,说明之前已经被引用过,直接返回此对象
      return children[index];
    }
    parents.push(parent);
    children.push(child);

    for (let i in parent) {
      // 递归
      child[i] = _clone(parent[i]);
    }

    return child;
  };
  return _clone(parent);
};

17、模糊搜索

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
// 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
}

//示例
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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
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)
    }
  }
}
// 示例
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"}

19、停止冒泡事件

1
2
3
4
5
6
7
8
const stopPropagation = (event) => {
  event = event || window.event;
  if (event.stopPropagation) {
    event.stopPropagation();
  } else {
    event.cancelBubble = true;
  }
};
---

©2019-2022

Built with Hexo and 3-hexo theme