前端常用方法封装

/**
* Created by jiachenpan on 16/11/18.
*/

export function parseTime(time, cFormat) {
if (arguments.length === 0) {
return null
}
const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
let date
if (typeof time === 'object') {
date = time
} else {
if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
time = parseInt(time)
}
if ((typeof time === 'number') && (time.toString().length === 10)) {
time = time * 1000
}
date = new Date(time)
}
const formatObj = {
y: date.getFullYear(),
m: date.getMonth() + 1,
d: date.getDate(),
h: date.getHours(),
i: date.getMinutes(),
s: date.getSeconds(),
a: date.getDay()
}
const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
let value = formatObj[key]
// Note: getDay() returns 0 on Sunday
if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value ] }
if (result.length > 0 && value < 10) {
value = '0' + value
}
return value || 0
})
return time_str
}

export function formatTime(time, option) {
if (('' + time).length === 10) {
time = parseInt(time) * 1000
} else {
time = +time
}
const d = new Date(time)
const now = Date.now()

const diff = (now - d) / 1000

if (diff < 30) {
return '刚刚'
} else if (diff < 3600) {
// less 1 hour
return Math.ceil(diff / 60) + '分钟前'
} else if (diff < 3600 * 24) {
return Math.ceil(diff / 3600) + '小时前'
} else if (diff < 3600 * 24 * 2) {
return '1天前'
}
if (option) {
return parseTime(time, option)
} else {
return (
d.getMonth() +
1 +
'月' +
d.getDate() +
'日' +
d.getHours() +
'时' +
d.getMinutes() +
'分'
)
}
}

// 格式化时间
export function getQueryObject(url) {
url = url == null ? window.location.href : url
const search = url.substring(url.lastIndexOf('?') + 1)
const obj = {}
const reg = /([^?&=]+)=([^?&=]*)/g
search.replace(reg, (rs, $1, $2) => {
const name = decodeURIComponent($1)
let val = decodeURIComponent($2)
val = String(val)
obj[name] = val
return rs
})
return obj
}

/**
* @param {Sting} input value
* @returns {number} output value
*/
export function byteLength(str) {
// returns the byte length of an utf8 string
let s = str.length
for (var i = str.length - 1; i >= 0; i--) {
const code = str.charCodeAt(i)
if (code > 0x7f && code <= 0x7ff) s++
else if (code > 0x7ff && code <= 0xffff) s += 2
if (code >= 0xDC00 && code <= 0xDFFF) i--
}
return s
}

export function cleanArray(actual) {
const newArray = []
for (let i = 0; i < actual.length; i++) {
if (actual[i]) {
newArray.push(actual[i])
}
}
return newArray
}

export function param(json) {
if (!json) return ''
return cleanArray(
Object.keys(json).map(key => {
if (json[key] === undefined) return ''
return encodeURIComponent(key) + '=' + encodeURIComponent(json[key])
})
).join('&')
}

export function param2Obj(url) {
const search = url.split('?')[1]
if (!search) {
return {}
}
return JSON.parse(
'{"' +
decodeURIComponent(search)
.replace(/"/g, '\"')
.replace(/&/g, '","')
.replace(/=/g, '":"')
.replace(/+/g, ' ') +
'"}'
)
}

export function html2Text(val) {
const div = document.createElement('div')
div.innerHTML = val
return div.textContent || div.innerText
}

export function objectMerge(target, source) {
/* Merges two objects,
giving the last one precedence */

if (typeof target !== 'object') {
target = {}
}
if (Array.isArray(source)) {
return source.slice()
}
Object.keys(source).forEach(property => {
const sourceProperty = source[property]
if (typeof sourceProperty === 'object') {
target[property] = objectMerge(target[property], sourceProperty)
} else {
target[property] = sourceProperty
}
})
return target
}

export function toggleClass(element, className) {
if (!element || !className) {
return
}
let classString = element.className
const nameIndex = classString.indexOf(className)
if (nameIndex === -1) {
classString += '' + className
} else {
classString =
classString.substr(0, nameIndex) +
classString.substr(nameIndex + className.length)
}
element.className = classString
}

export const pickerOptions = [
{
text: '今天',
onClick(picker) {
const end = new Date()
const start = new Date(new Date().toDateString())
end.setTime(start.getTime())
picker.$emit('pick', [start, end])
}
},
{
text: '最近一周',
onClick(picker) {
const end = new Date(new Date().toDateString())
const start = new Date()
start.setTime(end.getTime() - 3600 * 1000 * 24 * 7)
picker.$emit('pick', [start, end])
}
},
{
text: '最近一个月',
onClick(picker) {
const end = new Date(new Date().toDateString())
const start = new Date()
start.setTime(start.getTime() - 3600 * 1000 * 24 * 30)
picker.$emit('pick', [start, end])
}
},
{
text: '最近三个月',
onClick(picker) {
const end = new Date(new Date().toDateString())
const start = new Date()
start.setTime(start.getTime() - 3600 * 1000 * 24 * 90)
picker.$emit('pick', [start, end])
}
}
]

export function getTime(type) {
if (type === 'start') {
return new Date().getTime() - 3600 * 1000 * 24 * 90
} else {
return new Date(new Date().toDateString())
}
}

export function debounce(func, wait, immediate) {
let timeout, args, context, timestamp, result

const later = function() {
// 据上一次触发时间间隔
const last = +new Date() - timestamp

// 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait
if (last < wait && last > 0) {
timeout = setTimeout(later, wait - last)
} else {
timeout = null
// 如果设定为immediate===true,因为开始边界已经调用过了此处无需调用
if (!immediate) {
result = func.apply(context, args)
if (!timeout) context = args = null
}
}
}

return function(...args) {
context = this
timestamp = +new Date()
const callNow = immediate && !timeout
// 如果延时不存在,重新设定延时
if (!timeout) timeout = setTimeout(later, wait)
if (callNow) {
result = func.apply(context, args)
context = args = null
}

return result
}
}

/**
* This is just a simple version of deep copy
* Has a lot of edge cases bug
* If you want to use a perfect deep copy, use lodash's _.cloneDeep
*/
export function deepClone(source) {
if (!source && typeof source !== 'object') {
throw new Error('error arguments', 'deepClone')
}
const targetObj = source.constructor === Array ? [] : {}
Object.keys(source).forEach(keys => {
if (source[keys] && typeof source[keys] === 'object') {
targetObj[keys] = deepClone(source[keys])
} else {
targetObj[keys] = source[keys]
}
})
return targetObj
}

export function uniqueArr(arr) {
return Array.from(new Set(arr))
}

export function createUniqueString() {
const timestamp = +new Date() + ''
const randomNum = parseInt((1 + Math.random()) * 65536) + ''
return (+(randomNum + timestamp)).toString(32)
}

export function hasClass(ele, cls) {
return !!ele.className.match(new RegExp('(\s|^)' + cls + '(\s|$)'))
}
export function addClass(ele, cls) {
if (!hasClass(ele, cls)) ele.className += ' ' + cls
}
export function removeClass(ele, cls) {
if (hasClass(ele, cls)) {
const reg = new RegExp('(\s|^)' + cls + '(\s|$)')
ele.className = ele.className.replace(reg, ' ')
}
}
原文地址:https://www.cnblogs.com/huangxingquan/p/10722171.html