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js工具库 封装常用的工具函数 如深拷贝 时间转换日期格式化、浏览器判断等，提高开发效率
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<h1 class="page-title">Source: performance/index.js</h1>
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<pre class="prettyprint source linenums"><code>/*
* @Author: zhangyu
* @Email: zhangdulin@outlook.com
* @Date: 2021-06-16 17:44:08
* @LastEditors: zhangyu
* @LastEditTime: 2021-06-25 14:18:37
* @Description:
*/
/**
* @desc 函数防抖
* @param func 函数
* @param wait 延迟执行毫秒数
* @param immediate true 表立即执行，false 表非立即执行
*/
export const debounce = function (func, wait, immediate) {
let timeout
return function () {
const context = this
const args = arguments
if (timeout) clearTimeout(timeout)
if (immediate) {
var callNow = !timeout
timeout = setTimeout(() => {
timeout = null
}, wait)
if (callNow) func.apply(context, args)
} else {
timeout = setTimeout(function () {
func.apply(context, args)
}, wait)
}
}
}
/**
* @desc 函数节流
* @param func 函数
* @param wait 延迟执行毫秒数
* @param type 1 表时间戳版，2 表定时器版
*/
export const throttle = function (func, wait, type) {
if (type === 1) {
// eslint-disable-next-line no-unused-vars
const previous = 0
} else if (type === 2) {
// eslint-disable-next-line no-unused-varsutils
// eslint-disable-next-line no-unused-vars
let timeout
}
return function () {
const context = this
const args = arguments
if (type === 1) {
const now = Date.now()
if (now - previous > wait) {
func.apply(context, args)
previous = now
}
} else if (type === 2) {
if (!timeout) {
timeout = setTimeout(() => {
timeout = null
func.apply(context, args)
}, wait)
}
}
}
}
/**
* @description: 延迟执行函数
* @param {number|string} ms
* @param {function} callback
* @return {void}
*/
export const sleepAction = (ms, callback) => {
setTimeout(() => { callback() }, ms);
}
/**
* sync
*
* @description 睡眠
* @param {number|string} ms
* @returns {Promise<void>}
*/
export function sleepSync(ms) {
return new Promise(resolve => {
setTimeout(() => { resolve() }, ms);
})
}</code></pre>
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