Summary of JavaScript Common Tools Function Library
- 2021-08-16 23:03:35
- OfStack
A deep copy of an object or array
/**
* A deep copy of an object or array
* @param {*} cloneObj Cloned object
* @param {*} targetObj Cloned target object
* @param {*} isOverride If the attributes are duplicate, whether to overwrite the attributes of the cloned object
*/
function deepClone(cloneObj, targetObj, isOverride = true) {
const _toString = Object.prototype.toString
if (_toString.call(cloneObj) !== '[object Array]' && _toString.call(cloneObj) !== '[object Object]') {
return cloneObj
}
var cloneTarget = _toString.call(cloneObj) === '[object Array]' ? [] : {}
for (let key in cloneObj) {
if (Object.prototype.hasOwnProperty.call(cloneObj, key)) {
if (_toString.call(cloneObj[key]) === '[object Array]' || _toString.call(cloneObj[key]) === '[object Object]') {
cloneTarget[key] = deepClone(cloneObj[key])
} else {
cloneTarget[key] = cloneObj[key]
}
}
}
if (targetObj && (_toString.call(cloneObj) === _toString.call(targetObj))) {
// Note here that the target object of cloning should also be deepClone Under
cloneTarget = isOverride
? Object.assign(cloneTarget, deepClone(targetObj))
: Object.assign(deepClone(targetObj), cloneTarget)
}
return cloneTarget
}
Accurately judge the data type
// Accurately judge the data type
function getVerifyDataTypes() {
const types = ["String", "Number", "Boolean", "Null", "Undefined", "Function", "Object", "Array", "Date", "Error", "RegExp", "Symbol", "Map", "Set"]
let Type = {}
// Example usage: Type.isString('javascript')
for (let i = 0; i < types.length; i++) {
Type[`is${types[i]}`] = obj => Object.prototype.toString.call(obj) === `[object ${types[i]}]`
}
// Determine whether the string is json Format
Type.isJsonStr = str => {
if (typeof str == 'string') {
try {
let obj = JSON.parse(str);
if (obj && typeof obj == 'object') {
return true;
}
return false;
} catch (e) {
return false;
}
} else {
return false;
}
}
return Type
}
Date formatting
/**
* Date formatting
* @param {*} date Date object
* @param {*} beforeHyphen Year, month and day hyphen
* @param {*} afterHyphen Time division second hyphen
*/
function formatDate(date = new Date(), beforeHyphen = '-', afterHyphen = ':') {
const formatNumber = n => {
n = n.toString()
return n[1] ? n : `0${n}`
}
const year = date.getFullYear()
const month = date.getMonth() + 1
const day = date.getDate()
const hour = date.getHours()
const minute = date.getMinutes()
const second = date.getSeconds()
const ymd = [year, month, day].map(formatNumber).join(beforeHyphen)
const hms = [hour, minute, second].map(formatNumber).join(afterHyphen)
return `${ymd} ${hms}`
}
Convert the timestamp to the remaining days, hours, minutes and seconds
/**
* Converts the timestamp to the remaining days, hours, minutes, seconds, 1 It is generally applied to countdown scenes
* @param {*} timestamp Time stamp
*/
function converTimestamp(timestamp) {
const formatNumber = n => {
n = n.toString()
return n[1] ? n : `0${n}`
}
let day = Math.floor((timestamp / 1000 / 3600) / 24);
let hour = Math.floor((timestamp / 1000 / 3600) % 24);
let minute = Math.floor((timestamp / 1000 / 60) % 60);
let second = Math.floor(timestamp / 1000 % 60);
return {
day: day,
hour: formatNumber(hour),
minute: formatNumber(minute),
second: formatNumber(second)
}
}
Randomly fetch 1 item from the array
// Randomly fetch from the array 1 Items
function getRandomItemByArray(items) {
return items[Math.floor(Math.random() * items.length)];
}
Convert an array with a parent-child relationship into tree-structured data
let data = [
{ parentId: 0, id: 1, value: 'xxx' },
{ parentId: 1, id: 3, value: 'xxx' },
{ parentId: 4, id: 6, value: 'xxx' },
{ parentId: 3, id: 5, value: 'xxx' },
{ parentId: 2, id: 4, value: 'xxx' },
{ parentId: 1, id: 2, value: 'xxx' },
]
// Convert to tree Array Structure
function toTreeAry(arr, pId = 0) {
return arr
.filter(({ parentId }) => parentId === pId)
.map(a => ({
...a,
children: toTreeAry(arr.filter(({ parentId }) => parentId !== pId), a.id)
}))
}
// Convert to tree Object Structure
function toTreeObj(arr, pId = 0) {
let res = {}
arr.filter(({ parentId }) => parentId === pId)
.forEach(a => {
res[a.id] = {
...a,
children: toTreeObj(arr.filter(({ parentId }) => parentId !== pId), a.id)
}
})
return res
}
console.log(toTreeAry(data))
console.log(toTreeObj(data))
Generate random strings
// Random string
const randomStr = () => {
return new Date().getTime() + '-' + Math.random().toString(36).substr(2)
}
Filter html tags
// Filter html Label
const filterHTMLTag = (str) => {
str = str.replace(/<\/?[^>]*>/g, ''); // Removal HTML Tag
str = str.replace(/[|]*\n/, '') // Remove the space at the end of the line
str = str.replace(/&npsp;/ig, ''); // Remove npsp
return str;
}
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