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@@ -1,9 +1,3 @@
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-/**
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- * Parse the time to string
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- * @param {(Object|string|number)} time
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- * @param {string} cFormat
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- * @returns {string | null}
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- */
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export function parseTime (time, cFormat) {
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if (arguments.length === 0 || !time) {
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return null
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@@ -47,11 +41,6 @@ export function parseTime (time, cFormat) {
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return time_str
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}
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-/**
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- * @param {number} time
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- * @param {string} option
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- * @returns {string}
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- */
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export function formatTime (time, option) {
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if (('' + time).length === 10) {
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time = parseInt(time) * 1000
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@@ -90,264 +79,109 @@ export function formatTime (time, option) {
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}
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}
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-/**
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- * @param {string} url
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- * @returns {Object}
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- */
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-export function getQueryObject (url) {
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- url = url == null ? window.location.href : url
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- const search = url.substring(url.lastIndexOf('?') + 1)
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- const obj = {}
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- const reg = /([^?&=]+)=([^?&=]*)/g
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- search.replace(reg, (rs, $1, $2) => {
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- const name = decodeURIComponent($1)
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- let val = decodeURIComponent($2)
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- val = String(val)
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- obj[name] = val
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- return rs
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- })
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- return obj
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-}
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-
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-/**
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- * @param {string} input value
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- * @returns {number} output value
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- */
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-export function byteLength (str) {
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- // returns the byte length of an utf8 string
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- let s = str.length
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- for (var i = str.length - 1; i >= 0; i--) {
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- const code = str.charCodeAt(i)
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- if (code > 0x7f && code <= 0x7ff) s++
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- else if (code > 0x7ff && code <= 0xffff) s += 2
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- if (code >= 0xDC00 && code <= 0xDFFF) i--
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- }
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- return s
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-}
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-
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-/**
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- * @param {Array} actual
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- * @returns {Array}
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- */
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-export function cleanArray (actual) {
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- const newArray = []
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- for (let i = 0; i < actual.length; i++) {
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- if (actual[i]) {
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- newArray.push(actual[i])
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- }
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- }
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- return newArray
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-}
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-
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-/**
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- * @param {Object} json
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- * @returns {Array}
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- */
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-export function param (json) {
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- if (!json) return ''
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- return cleanArray(
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- Object.keys(json).map(key => {
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- if (json[key] === undefined) return ''
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- return encodeURIComponent(key) + '=' + encodeURIComponent(json[key])
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- })
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- ).join('&')
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-}
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-
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-/**
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- * @param {string} url
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- * @returns {Object}
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- */
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-export function param2Obj (url) {
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- const search = decodeURIComponent(url.split('?')[1]).replace(/\+/g, ' ')
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- if (!search) {
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- return {}
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- }
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- const obj = {}
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- const searchArr = search.split('&')
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- searchArr.forEach(v => {
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- const index = v.indexOf('=')
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- if (index !== -1) {
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- const name = v.substring(0, index)
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- const val = v.substring(index + 1, v.length)
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- obj[name] = val
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- }
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- })
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- return obj
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-}
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-
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-/**
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- * @param {string} val
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- * @returns {string}
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- */
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-export function html2Text (val) {
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- const div = document.createElement('div')
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- div.innerHTML = val
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- return div.textContent || div.innerText
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-}
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-
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-/**
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- * Merges two objects, giving the last one precedence
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- * @param {Object} target
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- * @param {(Object|Array)} source
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- * @returns {Object}
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- */
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-export function objectMerge (target, source) {
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- if (typeof target !== 'object') {
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- target = {}
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- }
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- if (Array.isArray(source)) {
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- return source.slice()
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- }
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- Object.keys(source).forEach(property => {
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- const sourceProperty = source[property]
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- if (typeof sourceProperty === 'object') {
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- target[property] = objectMerge(target[property], sourceProperty)
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- } else {
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- target[property] = sourceProperty
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- }
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- })
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- return target
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-}
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-
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-/**
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- * @param {HTMLElement} element
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- * @param {string} className
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- */
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-export function toggleClass (element, className) {
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- if (!element || !className) {
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- return
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- }
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- let classString = element.className
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- const nameIndex = classString.indexOf(className)
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- if (nameIndex === -1) {
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- classString += '' + className
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- } else {
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- classString =
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- classString.substr(0, nameIndex) +
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- classString.substr(nameIndex + className.length)
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- }
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- element.className = classString
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-}
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-
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-/**
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- * @param {string} type
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- * @returns {Date}
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- */
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-export function getTime (type) {
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- if (type === 'start') {
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- return new Date().getTime() - 3600 * 1000 * 24 * 90
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- }
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- return new Date()
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-}
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-
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-/**
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- * @param {Function} func
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- * @param {number} wait
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- * @param {boolean} immediate
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- * @return {*}
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- */
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-export function debounce (func, wait, immediate) {
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- let timeout, args, context, timestamp, result
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+export function debounce (fn, wait, immediate) {
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+ let timeout, context, args, timestamp
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const later = function () {
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// 据上一次触发时间间隔
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- const last = +new Date() - timestamp
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+ const last = Date.now() - timestamp
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// 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait
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- if (last < wait && last > 0) {
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+ if (last < wait) {
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timeout = setTimeout(later, wait - last)
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} else {
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- timeout = null
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- // 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
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if (!immediate) {
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- result = func.apply(context, args)
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- if (!timeout) context = args = null
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+ fn.apply(context, args)
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}
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+ timeout = context = args = null
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}
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}
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- return function (...args) {
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+ return function (...params) {
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+ timestamp = Date.now()
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context = this
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- timestamp = +new Date()
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- const callNow = immediate && !timeout
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+ args = params
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// 如果延时不存在，重新设定延时
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- if (!timeout) timeout = setTimeout(later, wait)
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- if (callNow) {
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- result = func.apply(context, args)
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- context = args = null
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+ if (!timeout) {
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+ timeout = setTimeout(later, wait)
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+ if (immediate) {
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+ fn.apply(context, args)
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+ context = params = null
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+ }
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}
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-
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- return result
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}
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}
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-/**
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- * This is just a simple version of deep copy
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- * Has a lot of edge cases bug
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- * If you want to use a perfect deep copy, use lodash's _.cloneDeep
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- * @param {Object} source
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- * @returns {Object}
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- */
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-export function deepClone (source) {
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- if (!source && typeof source !== 'object') {
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- throw new Error('error arguments', 'deepClone')
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+export function throttle (func, wait, options) {
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+ let timeout, context, args
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+
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+ // 上一次执行回调的时间戳
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+ let previous = 0
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+
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+ // 无传入参数时，初始化 options 为空对象
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+ if (!options) {
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+ options = {}
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}
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- const targetObj = source.constructor === Array ? [] : {}
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- Object.keys(source).forEach(keys => {
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- if (source[keys] && typeof source[keys] === 'object') {
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- targetObj[keys] = deepClone(source[keys])
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- } else {
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- targetObj[keys] = source[keys]
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- }
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- })
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- return targetObj
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-}
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-/**
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- * @param {Array} arr
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- * @returns {Array}
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- */
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-export function uniqueArr (arr) {
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- return Array.from(new Set(arr))
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-}
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+ const later = function () {
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+ // 当设置 { leading: false } 时
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+ // 每次触发回调函数后设置 previous 为 0
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+ // 不然为当前时间
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+ previous = options.leading === false ? 0 : Date.now()
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-/**
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- * @returns {string}
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- */
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-export function createUniqueString () {
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- const timestamp = +new Date() + ''
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- const randomNum = parseInt((1 + Math.random()) * 65536) + ''
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- return (+(randomNum + timestamp)).toString(32)
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-}
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+ // 执行函数
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+ func.apply(context, args)
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-/**
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- * Check if an element has a class
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- * @param {HTMLElement} elm
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- * @param {string} cls
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- * @returns {boolean}
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- */
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-export function hasClass (ele, cls) {
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- return !!ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'))
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-}
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+ timeout = context = args = null
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+ }
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-/**
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- * Add class to element
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- * @param {HTMLElement} elm
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- * @param {string} cls
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- */
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-export function addClass (ele, cls) {
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- if (!hasClass(ele, cls)) ele.className += ' ' + cls
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-}
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+ // 每次触发事件回调都执行这个函数
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+ // 函数内判断是否执行 func
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+ // func 才是我们业务层代码想要执行的函数
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+ return function (...params) {
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+ // 记录当前时间
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+ const now = Date.now()
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+
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+ // 第一次执行时（此时 previous 为 0，之后为上一次时间戳）
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+ // 并且设置了 { leading: false }（表示第一次回调不执行）
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+ // 此时设置 previous 为当前值，表示刚执行过，本次就不执行了
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+ if (!previous && options.leading === false) {
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+ previous = now
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+ }
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+
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+ // 距离下次触发 func 还需要等待的时间
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+ const remaining = wait - (now - previous)
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+ context = this
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+ args = params
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+
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+ // 要么是到了间隔时间了，随即触发方法（remaining <= 0）
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+ // 要么是没有传入 {leading: false}，且第一次触发回调，即立即触发
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+ // 此时 previous 为 0，wait - (now - previous) 也满足 <= 0
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+ // 之后便会把 previous 值迅速置为 now
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+ if (remaining <= 0 || remaining > wait) {
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+ if (timeout) {
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+ clearTimeout(timeout)
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+
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+ // clearTimeout(timeout) 并不会把 timeout 设为 null
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+ // 手动设置，便于后续判断
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+ timeout = null
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+ }
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-/**
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- * Remove class from element
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- * @param {HTMLElement} elm
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- * @param {string} cls
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- */
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-export function removeClass (ele, cls) {
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- if (hasClass(ele, cls)) {
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- const reg = new RegExp('(\\s|^)' + cls + '(\\s|$)')
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- ele.className = ele.className.replace(reg, ' ')
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+ // 设置 previous 为当前时间
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+ previous = now
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+
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+ // 执行 func 函数
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+ func.apply(context, args)
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+ if (!timeout) {
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+ context = args = null
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+ }
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+ } else if (!timeout && options.trailing !== false) {
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+ // 最后一次需要触发的情况
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+ // 如果已经存在一个定时器，则不会进入该 if 分支
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+ // 如果 {trailing: false}，即最后一次不需要触发了，也不会进入这个分支
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+ // 间隔 remaining milliseconds 后触发 later 方法
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+ timeout = setTimeout(later, remaining)
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+ }
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}
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}
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daigang