vue时间戳转换日期格式

一，vue获取时间戳转换为日期格式

后台返回的时间戳格式（例如：creatTime: 1626832597790），需要用时间格式显示

（1）需要2021-09-05格式显示

      	<el-table-column align="center" label="发布日期">
          <template slot-scope="scope">
            <span v-if="scope.row.creatTime != null">
            	{
    {
     parseTime(scope.row.creatTime, "{y}-{m}-{d}") }}
            </span>
          </template>
        </el-table-column>

（2）需要2021-08-27 09:19:35格式显示

        <el-table-column align="center" label="提交反馈时间">
          <template slot-scope="scope">
            <span v-if="scope.row.creatTimes!= null">
              {
    {
     parseTime(scope.row.creatTime ) }}
            </span>
          </template>
        </el-table-column>

二， 需要向后台传时间戳格式的写法 如下格式

（1）2020-09-28格式转时间戳

  return{
    
	  form:{
    
		  startTime:"",
	      endTime:"",
	   }
  }

   startTime:new Date(this.form.startTime).getTime()
   endTime: new Date(this.form.endTime).getTime()

（2）如果开始时间或者结束时间取当天时间

  return{
    
	  form:{
    
		 startTime: new Date(),
	     endTime:"",
	  }
  }

   startTime: new Date(this.form.startTime).getTime()
   endTime: new Date(this.form.endTime).getTime()

（3）如下格式 2021-09-28—2021-09-30格式

   <el-form-item>
          <span class="demonstration">日期筛选：</span>
          <el-date-picker
            v-model="createTime"
            type="daterange"
            range-separator="至"
            start-placeholder="开始日期"
            end-placeholder="结束日期"
          >
          </el-date-picker>
        </el-form-item>

  return{
    
      createTime:"",
  }

  startTime:this.createTime && this.createTime[0] ? new Date(this.createTime[0]).getTime() : "",
  endTime:this.createTime && this.createTime[1] ? new Date(this.createTime[1]).getTime(): "",

三，获取当前的年月日时分秒并展示

<div class="rightime">
    <div class="span1">{
   { nowtime }}</div >
</div>

  return{
    
      nowtime:""
  }
  mounted(){
    
  setInterval(() => {
    
      this.getTime();
    }, 1000);
  },
  methods:{
    
  getTime() {
    
      this.nowtime = parseTime(new Date(), '{y}年{m}月{d}日 {h}:{i}:{s} 周{a}');
    },
}

四，需要传（2021-12-16）

<el-date-picker type="date" placeholder="选择日期" v-model="auditorPostponeTime"> </el-date-picker>

data(){
    
  return{
    
    auditorPostponeTime:'',
 }
}
 let times = '';
      if (this.auditorPostponeTime) {
    
        times = parseTime(this.auditorPostponeTime, '{y}-{m}-{d}');
      }
      let req={
    
      auditorPostponeTime: times, //同意选择的时间
     }

五，注意：代码中必须要引入date.js文件，并在方法中使用即可，否则以上不成立

  import {
     parseTime } from "@/utils/date";

（1）创建一个date.js文件，内容如下：

/**
 * Parse the time to string
 * @param {(Object|string|number)} time
 * @param {string} cFormat
 * @returns {string | null}
 */
export function parseTime(time, cFormat) {
  if (arguments.length === 0) {
    return null
  }
  const format = cFormat || '{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)
    }
    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(/{([ymdhisa])+}/g, (result, key) => {
    const value = formatObj[key]
    // Note: getDay() returns 0 on Sunday
    if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value] }
    return value.toString().padStart(2, '0')
  })
  return time_str
}

/**
 * @param {number} time
 * @param {string} option
 * @returns {string}
 */
export function formatTime(time, option) {
  if (('' + time).length === 10) {
    time = parseInt(time) * 1000
  } else {
    time = +time
  }
  const d = new Date(time)
  const now = Date.now()

  const diff = (now - d) / 1000

  if (diff < 30) {
    return '刚刚'
  } else if (diff < 3600) {
    // less 1 hour
    return Math.ceil(diff / 60) + '分钟前'
  } else if (diff < 3600 * 24) {
    return Math.ceil(diff / 3600) + '小时前'
  } else if (diff < 3600 * 24 * 2) {
    return '1天前'
  }
  if (option) {
    return parseTime(time, option)
  } else {
    return (
      d.getMonth() +
      1 +
      '月' +
      d.getDate() +
      '日' +
      d.getHours() +
      '时' +
      d.getMinutes() +
      '分'
    )
  }
}

/**
 * @param {string} url
 * @returns {Object}
 */
export function param2Obj(url) {
  const search = url.split('?')[1]
  if (!search) {
    return {}
  }
  return JSON.parse(
    '{"' +
    decodeURIComponent(search)
      .replace(/"/g, '\\"')
      .replace(/&/g, '","')
      .replace(/=/g, '":"')
      .replace(/\+/g, ' ') +
    '"}'
  )
}