关于前端:JS日期格式化获取近7天近半年近一年日期ReactReact-Native

文档：JS日期对象

Date.prototype.Format = function (fmt) {    let o = {        "M+": this.getMonth() + 1, //月份        "d+": this.getDate(), //日        "H+": this.getHours(), //小时        "m+": this.getMinutes(), //分        "s+": this.getSeconds(), //秒        "q+": Math.floor((this.getMonth() + 3) / 3), //季度        "S": this.getMilliseconds() //毫秒    };    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substring(4 - RegExp.$1.length));    for (let k in o) {        if (new RegExp("(" + k + ")").test(fmt)) {            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substring(("" + o[k]).length)));        }    }    return fmt;}/** * @description: 日期格局转换 * @param  {*} * @return {*} * @param {*} date new Date()参数: * new Date();无 * new Date(value);Unix工夫戳：1652054400000 * new Date(dateString);工夫戳字符串：'2020-05-09' * new Date(year, monthIndex [, day [, hours [, minutes [, seconds [, milliseconds]]]]]);别离提供日期与工夫的每一个成员 * @param {*} type 日期格局(英文按示例用，辨别字母大小写) e.g "yyyy年MM月dd日 HH:mm:ss" */export const getFormatDate = (date, type) => {    let curDate = date || new Date()    let newDate = new Date(curDate).Format(type)    const ts = + newDate    return ts}/** * @description: 获取n年前指定日期 * @param {*} n * @return {*} Unix Time Stamp e.g: 1652054400000 */export const getYearAgoDate = (n = 0) => {    let curDate = new Date()    curDate.setFullYear(curDate.getFullYear() - n)    const ts = + curDate    return ts}/** * @description: 获取n月前指定日期 * @param {*} n * @return {*} Unix Time Stamp e.g: 1652054400000 */export const getMonthAgoDate = (n = 0) => {    let curDate = new Date()    curDate.setMonth(curDate.getMonth() - n)    const ts = + curDate    return ts}/** * @description: 获取n天前指定日期 * @param {*} n * @return {*} Unix Time Stamp e.g: 1652054400000 */export const getDayAgoDate = (n = 0) => {    let curDate = new Date();    let newDate = new Date(curDate - 1000 * 60 * 60 * 24 * n);    const ts = + newDate    return ts}