Angular6 项目开发常用时间组件服务

一、利用Angular 命令行工具生成一个服务。

　　详情见：《Angular环境搭建》，服务代码如下：

 import { Injectable } from '@angular/core';

 @Injectable({
   providedIn: 'root'
 })
 export class TimeutilProvider {

   private today: Date;
   private year: String;
   private mouth: String;
   private date: String;
   private hours: String;
   private minutes: String;
   private seconds: String;
   private milliseconds: String;
   private week:number;
   private weekday:Array<string> =["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
   constructor () {
     this.today = new Date();
     this.year = this.today.getFullYear().toString();
     this.mouth = (this.today.getMonth() + 1).toString();
     this.date = this.today.getDate().toString();
     this.hours = this.today.getHours().toString();
     this.minutes = this.today.getMinutes().toString();
     this.seconds = this.today.getSeconds().toString();
     this.milliseconds = this.today.getMilliseconds().toString();

     this.week = this.today.getDay();

     if (Number(this.mouth) < 10) {
       this.mouth = '0' + this.mouth;
     } else {
     }
     if (Number(this.date) < 10) {
       this.date = '0' + this.date;
     } else {
     }
     if (Number(this.hours) < 10) {
       this.hours = '0' + this.hours;
     } else {
     }
     if (Number(this.minutes) < 10) {
       this.minutes = '0' + this.minutes;
     } else {
     }
     if (Number(this.seconds) < 10) {
       this.seconds = '0' + this.seconds;
     }
     if (10 > Number(this.milliseconds)) {
       this.milliseconds = '00' + this.milliseconds;
     } else if ((10 <= Number(this.milliseconds)) && (100 > Number(this.milliseconds))) {
       this.milliseconds = '0' + this.milliseconds;
     } else {
       // dothing
     }
   }

   //返回当前星期
   currentWeek(){
     return this.weekday[this.week].toString();
     // this.week.toString();
   }

   //20190306115830234格式
   currentTime() {
     return this.year + '' + this.mouth + '' + this.date + '' + this.hours + '' + this.minutes + '' + this.seconds + '' + this.milliseconds;
   }

   //一般用于生成唯一标识，例如uuid
   currentTime_id() {
     // 三位随机数以免重复
     const random = (Math.random() * 100000000000000000).toString().substr(0, 3);

     return this.year + '' + this.mouth + '' + this.date + ''
     + this.hours + '' + this.minutes + '' + this.seconds + '' + this.milliseconds + random;
   }

   //2019-03-06 11:59格式
   currentTime_datestyle() {
     return this.year + '-' + this.mouth + '-' + this.date + ' ' + this.hours + ':' + this.minutes + '';
   }

   //2019-03-06 11:59:30格式
   currentTime_datesecondsstyle() {
     return this.year + '-' + this.mouth + '-' + this.date + ' ' + this.hours + ':' + this.minutes + ':' + this.seconds;
   }

   // currentTime_date(){
   //   return this.year + '-' + this.mouth + '-' + this.date;
   // }

   // 返回当前时间"10:25:34"格式
   currentTime_time(){
     let now=new Date();
     let year  = (now.getFullYear()).toString();
     let month = (now.getMonth()+1).toString();
     let date  = (now.getDate()).toString();
     let hour  = (now.getHours()).toString();
     let minute= (now.getMinutes()).toString();
     let second= (now.getSeconds()).toString();

     if (Number(month) < 10) {
           month = '0' + month;
     } else {
     }
     if (Number(date) < 10) {
           date = '0' + date;
     } else {
     }
     if (Number(hour) < 10) {
           hour = '0' + hour;
     } else {
     }
     if (Number(minute) < 10) {
           minute = '0' + minute;
     } else {
     }
     if (Number(second) < 10) {
           second = '0' + second;
     }

     return hour + ':' + minute + ':' + second;
   }

   //将当前时间转化为消息类型时间，2019.03.06 11:56:30格式
   convertToDate_msgTimestamp(nows){
     let now=new Date(nows);
     let year  = (now.getFullYear()).toString();
     let month = (now.getMonth()+1).toString();
     let date  = (now.getDate()).toString();
     let hour  = (now.getHours()).toString();
     let minute= (now.getMinutes()).toString();
     let second= (now.getSeconds()).toString();

     if (Number(month) < 10) {
           month = '0' + month;
     } else {
     }
     if (Number(date) < 10) {
           date = '0' + date;
     } else {
     }
     if (Number(hour) < 10) {
           hour = '0' + hour;
     } else {
     }
     if (Number(minute) < 10) {
           minute = '0' + minute;
     } else {
     }
     if (Number(second) < 10) {
           second = '0' + second;
     }
       return year+"."+month+"."+date+" "+hour+":"+minute+":"+second;
   }

   //2019-03-06 11:56:30格式
   convertToDate_timestamp(nows){
     var now=new Date(nows);
     var year  = (now.getFullYear()).toString();
     var month = (now.getMonth()+1).toString();
     var date  = (now.getDate()).toString();
     var hour  = (now.getHours()).toString();
     var minute= (now.getMinutes()).toString();
     var second= (now.getSeconds()).toString();

     if (Number(month) < 10) {
           month = '0' + month;
     } else {
     }
     if (Number(date) < 10) {
           date = '0' + date;
     } else {
     }
     if (Number(hour) < 10) {
           hour = '0' + hour;
     } else {
     }
     if (Number(minute) < 10) {
           minute = '0' + minute;
     } else {
     }
     if (Number(second) < 10) {
           second = '0' + second;
     }
       return year+"-"+month+"-"+date+" "+hour+":"+minute+":"+second;
   }

   //将消息时间格式转化为时间戳格式
   convertTotimestamp(date:string){
     return date.replace(".","-");
   }

   //将消息时间格式转化为Date类型
   convertMsgtimeToDate(date:string){
     //date = "2018.11.01 10:00:00";
     date.replace(".","-");
     return new Date(date)
   }

   //将时间戳格式日期转化为Date类型
   convertTimestampToDate(date:string){
     return new Date(date)
   }

   //获取当前时间前一天时间
   getYestardayTime(){
    return new Date(new Date().getTime() - 24*60*60*1000);
   }

   //返回当前日期“2018-02-03”格式
   currentTime_daystyle() {
       return this.year + "-" + this.mouth + "-" + this.date + " ";
   }

   //返回当前时间前一天时间“2018.02.03”格式
   currentPreviousTime_daystyle() {
     let previousDate = new Date(new Date().getTime() - 24*60*60*1000);
     var year  = (previousDate.getFullYear()).toString();
     var month = (previousDate.getMonth()+1).toString();
     var date  = (previousDate.getDate()).toString();
     if (Number(month) < 10) {
       month = '0' + month;
     } else {
     }
     if (Number(date) < 10) {
           date = '0' + date;
     } else {
     }

     return year + "." + month + "." + date + " ";
   }
 }

二、时间服务的使用

　　1.在要是用的组建构造函数中依赖注入，如下图：　

 constructor(private timeutil : TimeutilProvider) {
      //调用方法
      console.log("id:",this.timeutil.currentTime_id(););
 }