前端 js 日期格式化

// 日期格式化
export const parseTime = (time, pattern)  => {
    if (arguments.length === 0 || !time) {
        return null;
    }
    const format = pattern || '{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)
        } else if (typeof time === 'string') {
            time = time.replace(new RegExp(/-/gm), '/');
        }
        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
}

转码

// url转码
export const paramToEncode = ( url ) => {
  if(!url) return
  return encodeURI(url)
}
// url解码
export const paramToDecode = ( url ) => {
  if(!url) return
  return decodeURI(url)
}

从URL中解析参数

/**
 * @param {String} url
 * @description 从URL中解析参数
 */
export const getParams = url => {
  const keyValueArr = url.split('?')[1].split('&')
  let paramObj = {}
  keyValueArr.forEach(item => {
    const keyValue = item.split('=')
    paramObj[keyValue[0]] = keyValue[1]
  })
  return paramObj
}

回调函数需要执行的次数

/**
 * @param {Number} times 回调函数需要执行的次数
 * @param {Function} callback 回调函数
 */
export const doCustomTimes = (times, callback) => {
  let i = -1
  while (++i < times) {
    callback(i)
  }
}

// 日期格式化
export const parseTime = (time, pattern)  => {
    if (arguments.length === 0 || !time) {
        return null;
    }
    const format = pattern || '{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)
        } else if (typeof time === 'string') {
            time = time.replace(new RegExp(/-/gm), '/');
        }
        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
}