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const forEach = (arr, fn) => {\n if (!arr.length || !fn) return\n let i = -1\n let len = arr.length\n while (++i < len) {\n let item = arr[i]\n fn(item, i, arr)\n }\n}\n\n/**\n * @param {Array} arr1\n * @param {Array} arr2\n * @description 得到两个数组的交集, 两个数组的元素为数值或字符串\n */\nexport const getIntersection = (arr1, arr2) => {\n let len = Math.min(arr1.length, arr2.length)\n let i = -1\n let res = []\n while (++i < len) {\n const item = arr2[i]\n if (arr1.indexOf(item) > -1) res.push(item)\n }\n return res\n}\n\n/**\n * @param {Array} arr1\n * @param {Array} arr2\n * @description 得到两个数组的并集, 两个数组的元素为数值或字符串\n */\nexport const getUnion = (arr1, arr2) => {\n return Array.from(new Set([...arr1, ...arr2]))\n}\n\n/**\n * @param {Array} target 目标数组\n * @param {Array} arr 需要查询的数组\n * @description 判断要查询的数组是否至少有一个元素包含在目标数组中\n */\nexport const hasOneOf = (targetarr, arr) => {\n return targetarr.some(_ => arr.indexOf(_) > -1)\n}\n\n/**\n * @param {String|Number} value 要验证的字符串或数值\n * @param {*} validList 用来验证的列表\n */\nexport function oneOf (value, validList) {\n for (let i = 0; i < validList.length; i++) {\n if (value === validList[i]) {\n return true\n }\n }\n return false\n}\n\n/**\n * @param {Number} timeStamp 判断时间戳格式是否是毫秒\n * @returns {Boolean}\n */\nconst isMillisecond = timeStamp => {\n const timeStr = String(timeStamp)\n return timeStr.length > 10\n}\n\n/**\n * @param {Number} timeStamp 传入的时间戳\n * @param {Number} currentTime 当前时间时间戳\n * @returns {Boolean} 传入的时间戳是否早于当前时间戳\n */\nconst isEarly = (timeStamp, currentTime) => {\n return timeStamp < currentTime\n}\n\n/**\n * @param {Number} num 数值\n * @returns {String} 处理后的字符串\n * @description 如果传入的数值小于10，即位数只有1位，则在前面补充0\n */\nconst getHandledValue = num => {\n return num < 10 ? '0' + num : num\n}\n\n/**\n * @param {Number} timeStamp 传入的时间戳\n * @param {Number} startType 要返回的时间字符串的格式类型，传入'year'则返回年开头的完整时间\n */\nconst getDate = (timeStamp, startType) => {\n const d = new Date(timeStamp * 1000)\n const year = d.getFullYear()\n const month = getHandledValue(d.getMonth() + 1)\n const date = getHandledValue(d.getDate())\n const hours = getHandledValue(d.getHours())\n const minutes = getHandledValue(d.getMinutes())\n const second = getHandledValue(d.getSeconds())\n let resStr = ''\n if (startType === 'year') resStr = year + '-' + month + '-' + date + ' ' + hours + ':' + minutes + ':' + second\n else resStr = month + '-' + date + ' ' + hours + ':' + minutes\n return resStr\n}\n\n/**\n * @param {String|Number} timeStamp 时间戳\n * @returns {String} 相对时间字符串\n */\nexport const getRelativeTime = timeStamp => {\n // 判断当前传入的时间戳是秒格式还是毫秒\n const IS_MILLISECOND = isMillisecond(timeStamp)\n // 如果是毫秒格式则转为秒格式\n if (IS_MILLISECOND) Math.floor(timeStamp /= 1000)\n // 传入的时间戳可以是数值或字符串类型，这里统一转为数值类型\n timeStamp = Number(timeStamp)\n // 获取当前时间时间戳\n const currentTime = Math.floor(Date.parse(new Date()) / 1000)\n // 判断传入时间戳是否早于当前时间戳\n const IS_EARLY = isEarly(timeStamp, currentTime)\n // 获取两个时间戳差值\n let diff = currentTime - timeStamp\n // 如果IS_EARLY为false则差值取反\n if (!IS_EARLY) diff = -diff\n let resStr = ''\n const dirStr = IS_EARLY ? '前' : '后'\n // 少于等于59秒\n if (diff <= 59) resStr = diff + '秒' + dirStr\n // 多于59秒，少于等于59分钟59秒\n else if (diff > 59 && diff <= 3599) resStr = Math.floor(diff / 60) + '分钟' + dirStr\n // 多于59分钟59秒，少于等于23小时59分钟59秒\n else if (diff > 3599 && diff <= 86399) resStr = Math.floor(diff / 3600) + '小时' + dirStr\n // 多于23小时59分钟59秒，少于等于29天59分钟59秒\n else if (diff > 86399 && diff <= 2623859) resStr = Math.floor(diff / 86400) + '天' + dirStr\n // 多于29天59分钟59秒，少于364天23小时59分钟59秒，且传入的时间戳早于当前\n else if (diff > 2623859 && diff <= 31567859 && IS_EARLY) resStr = getDate(timeStamp)\n else resStr = getDate(timeStamp, 'year')\n return resStr\n}\n\n/**\n * @returns {String} 当前浏览器名称\n */\nexport const getExplorer = () => {\n const ua = window.navigator.userAgent\n const isExplorer = (exp) => {\n return ua.indexOf(exp) > -1\n }\n if (isExplorer('MSIE')) return 'IE'\n else if (isExplorer('Firefox')) return 'Firefox'\n else if (isExplorer('Chrome')) return 'Chrome'\n else if (isExplorer('Opera')) return 'Opera'\n else if (isExplorer('Safari')) return 'Safari'\n}\n\n/**\n * @description 绑定事件 on(element, event, handler)\n */\nexport const on = (function () {\n if (document.addEventListener) {\n return function (element, event, handler) {\n if (element && event && handler) {\n element.addEventListener(event, handler, false)\n }\n }\n } else {\n return function (element, event, handler) {\n if (element && event && handler) {\n element.attachEvent('on' + event, handler)\n }\n }\n }\n})()\n\n/**\n * @description 解绑事件 off(element, event, handler)\n */\nexport const off = (function () {\n if (document.removeEventListener) {\n return function (element, event, handler) {\n if (element && event) {\n element.removeEventListener(event, handler, false)\n }\n }\n } else {\n return function (element, event, handler) {\n if (element && event) {\n element.detachEvent('on' + event, handler)\n }\n }\n }\n})()\n\n/**\n * 判断一个对象是否存在key，如果传入第二个参数key，则是判断这个obj对象是否存在key这个属性\n * 如果没有传入key这个参数，则判断obj对象是否有键值对\n */\nexport const hasKey = (obj, key) => {\n if (key) return key in obj\n else {\n let keysArr = Object.keys(obj)\n return keysArr.length\n }\n}\n\n/**\n * @param {*} obj1 对象\n * @param {*} obj2 对象\n * @description 判断两个对象是否相等，这两个对象的值只能是数字或字符串\n */\nexport const objEqual = (obj1, obj2) => {\n const keysArr1 = Object.keys(obj1)\n const keysArr2 = Object.keys(obj2)\n if (keysArr1.length !== keysArr2.length) return false\n else if (keysArr1.length === 0 && keysArr2.length === 0) return true\n /* eslint-disable-next-line */\n else return !keysArr1.some(key => obj1[key] != obj2[key])\n}\n"]}]}
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