v-if="(item.day - new Date().getTime()) * 1.0 / (1000 * 60 * 60) > 24 && (new Date().getTime()) < item.day

disabledDate: (time) => { let nowDate = new Date() - 24 * 60 * 60 * 1000 return time.getTime() > nowDate }

函数首先创建了一个变量nowDate，它存储了当前时间减去一天的时间间隔（24小时 * 60分钟 * 60秒 * 1000毫秒）。然后，函数比较给定时间time的毫秒表示是否大于nowDate的毫秒表示。如果是，则返回true，否则...

new Date()) - 1000 * 60 * 60 * 24 * 1

在这段代码中，通过new Date().getTime()获取当前时间的毫秒数，然后减去1000 * 60 * 60 * 24 * 1，即一天的毫秒数，得到前一天的时间。这样就可以获取到当前时间的前一天的时间。 #### 引用[.reference_title] - *1...

var demo = document.getElementById("demo"); var timer = document.getElementById("timer"); var now = new Date(); var expire = new Date(now.getTime() + 7 * 24 * 60 * 60 * 1000); // 计算相差的时间（单位：毫秒） var diff = expire.getTime() - now.getTime(); function startTimer() { // 转换为天、小时、分钟、秒 var days = Math.floor(diff / (24 * 60 * 60 * 1000)); var hours = Math.floor((diff % (24 * 60 * 60 * 1000)) / (60 * 60 * 1000)); var minutes = Math.floor((diff % (60 * 60 * 1000)) / (60 * 1000)); var seconds = Math.floor((diff % (60 * 1000)) / 1000); // 显示倒计时 demo.innerHTML = "距离过期还有:" + days + "天" + hours + "小时" + minutes + "分钟" + seconds + "秒"; diff -= 1000; // 如果还没到过期时间，继续倒计时 if (diff > 0) { setTimeout(startTimer, 1000); } else { // 到了过期时间，提示用户 timer.innerHTML = "已经过期!"; } } 封装这个函数

var hours = Math.floor((diff % (24 * 60 * 60 * 1000)) / (60 * 60 * 1000)); var minutes = Math.floor((diff % (60 * 60 * 1000)) / (60 * 1000)); var seconds = Math.floor((diff % (60 * 1000)) / 1000); ...

import { Icon } from '@ali/deep'; import React, { FC, useState } from 'react'; import styles from './style.module.css'; interface IDayParams { minAdvanceTime: number; maxAdvanceTime: number; bookDate: number; } const DateSelector: FC<IDayParams> = ({ bookDate, minAdvanceTime, maxAdvanceTime }) => { console.log('maxAdvanceTime',maxAdvanceTime) const [date, setDate] = useState(new Date(bookDate)); const handlePrevClick = () => { const newDate = new Date(date.getTime() - 15 * 24 * 60 * 60 * 1000); const today = new Date(); if (newDate < today) { setDate(today); } else { setDate(newDate); } }; const handleNextClick = () => { const newDate = new Date(date.getTime() + 15 * 24 * 60 * 60 * 1000); setDate(newDate); }; const formatDate = (date) => { const month = (date.getMonth() + 1).toString().padStart(2, '0'); const day = date.getDate().toString().padStart(2, '0'); return ${month}/${day}日; }; const renderDateRange = () => { const start = new Date(date.getTime() - 0 * 24 * 60 * 60 * 1000); const end = new Date(date.getTime() + 14 * 24 * 60 * 60 * 1000); const firstDay = new Date(start); const lastDay = new Date(end); return ( {formatDate(firstDay)} - {formatDate(lastDay)} ); }; return ( <Icon type="arrow-double-left" onClick={handlePrevClick} className={styles.icon} /> {renderDateRange()} <Icon type="arrow-double-right" onClick={handleNextClick} className={styles.icon} /> ); }; export default DateSelector;不如最大时间是15天，就不能往下点了，应该值写

const newDate = new Date(date.getTime() + 15 * 24 * 60 * 60 * 1000); if (newDate > new Date(maxAdvanceTime)) { return; } setDate(newDate); }; 这样就可以实现最大时间为15天的限制了。

<template> 京东秒杀 {{ formatTime(startTime) }}点场 0"> <van-count-down :time="countdown" /> 秒杀已开始！￥{{ item.oldPrice }} ￥{{ item.price }} </template> <script> import { getSecondsApi } from "@/api/second"; export default { data() { return { secondList: [], countdown: 0, // 倒计时剩余时间 startTime: new Date("2023-06-02 17:00:00").getTime(), // 秒杀开始时间 }; }, methods: { // 格式化时间，将毫秒数转换为小时、分钟、秒 formatTime(time) { const hour = Math.floor(time / (60 * 60 * 1000)); const minute = Math.floor((time % (60 * 60 * 1000)) / (60 * 1000)); const second = Math.floor((time % (60 * 1000)) / 1000); return ${hour}小时${minute}分钟${second}秒; }, }, async created() { // 计算倒计时剩余时间 const nowTime = new Date().getTime(); this.countdown = this.startTime - nowTime; // 每秒钟更新一次倒计时 setInterval(() => { this.countdown -= 1000; }, 1000); try { let { data } = await getSecondsApi(); this.secondList = data.data.list; // console.log(this.secondList); } catch (err) { console.log(err); } }, }; </script>怎么把秒杀开始时间换成整点

要把秒杀开始时间换成整点，只...将 new Date("2023-06-02 17:00:00").getTime() 修改为 new Date("2023-06-02 17:00:00").setMinutes(0, 0, 0).getTime() 即可。这样就可以将秒杀开始时间改为整点，即 17:00:00。

<template> {{ countdown.days }}天 {{ countdown.hours }}时 {{ countdown.minutes }}分 {{ countdown.seconds }}秒 </template> <script> export default { name: 'WebIndex', data() { return { endTime: '2023-07-04 00:00:00', // 倒计时结束时间 countdown: {}, // 定义响应式数据 }; }, methods: { updateTime() { let now = new Date().getTime(); // 获取当前时间戳 let end = new Date(this.endTime).getTime(); // 获取倒计时结束时间戳 let diff = end - now; // 计算时间差 // 计算天、时、分、秒 let days = Math.floor(diff / (1000 * 60 * 60 * 24)); let hours = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60)); let minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60)); let seconds = Math.floor((diff % (1000 * 60)) / 1000); // 更新响应式数据 this.countdown = { days: days, hours: hours, minutes: minutes, seconds: seconds, }; }, }, created() { this.updateTime(); // 初始化倒计时 setInterval(() => { this.updateTime(); // 更新倒计时 }, 1000); }, }; </script> <style lang="less" scoped> </style>实现时间差为0的时候清除倒计时

let hours = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60)); let minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60)); let seconds = Math.floor((diff % (1000 * 60)) / 1000); ...

<el-form-item label="颁发日期" :rules="[{ required: true, message: '颁发日期不能为空' }]"> <el-date-picker v-model="formData.promulgateDate" value-format="yyyy-MM-dd" type="year" placeholder="选择年" :style="{ width: '33%' }" > </el-date-picker> </el-form-item> <el-form-item label="实施日期" :rules="[{ required: true, message: '实施日期不能为空' }]"> <el-date-picker v-model="formData.execDate" value-format="yyyy-MM-dd" type="year" placeholder="选择年" :style="{ width: '33%' }" :picker-options="expireTimeOption" > </el-date-picker> </el-form-item> <el-form-item label="失效日期" :rules="[{ required: true, message: '失效日期不能为空' }, { validator: (rule, value, callback) => checkExpiryDate(rule, value, callback, formData.promulgateDate), trigger: 'blur' }]"> <el-date-picker v-model="formData.expiryDate" value-format="yyyy-MM-dd" type="year" placeholder="选择年" :style="{ width: '33%' }" :picker-options="expiryDateOption"> </el-date-picker> </el-form-item> 通过这种方法 expireTimeOption: { disabledDate: (time) => { return time.getTime()< new Date(this.formData.promulgateDate).getTime() || time.getTime() > new Date(this.formData.expiryDate).getTime() } }, 让execDate只能选择promulgateDate和expiryDate之间的日期，expiryDate又不能选择早于promulgateDate这个的日期。如果先选择的execDate这个日期，在选择的promulgateDate和expiryDate，导致最开始选择的execDate日期选择的超出了

您的代码中有一个日期选择器，其中expireTimeOption是一个选项对象，用于限制execDate只能选择promulgateDate和expiryDate之间的日期。而且expiryDate不能选择早于promulgateDate的日期。如果先选择了execDate，再...

obj[new Date(nowTime - 1000606024i).format('MM-dd')] = nowTime - 1000606024i;

其中，nowTime - 1000*60*60*24*i表示当前时间往前推i天的时间，new Date()将其转换为Date对象，format('MM-dd')将其格式化为"月-日"的形式，最后将日期和对应的毫秒值存储在obj对象中。 javascript let obj = ...

userBook.setBackTime(new Date(userBook.getBackTime().getTime()+52460601000));

它首先通过userBook.getBackTime()获取到原本的归还时间（一个Date类型的对象），然后将它的时间戳（自1970年1月1日以来的毫秒数）加上5天的毫秒数（即5*24*60*60*1000），得到新的时间戳。最后，它使用new Date...

this.worker = this.$worker .run((originalData) => { const st = new Date().getTime(); const len = originalData.length; console.log('startTime ====> ', st); const allDates = new Set(); originalData.forEach((cData) => { cData.data.forEach((item) => { allDates.add(item.trade_date); }); }); const sortDate = Array.from(allDates).sort((a, b) => +a - +b); const newArr = Array.from({ length: len }, () => []); sortDate.forEach((date, d) => { originalData.forEach((rDate, index) => { if (!newArr[index]) { newArr[index] = []; } const hasData = rDate.data.find((fd) => fd.trade_date === date); if (hasData) { newArr[index][d] = hasData.profit; } else { newArr[index][d] = null; } }); }); originalData.forEach((rDate, index) => { rDate.data = newArr[index]; rDate.dateData = sortDate; }); console.log('endTime ====> ', (new Date().getTime() - st) / 1000); return originalData; }, [res]) .then((fixedArr) => { this.proData = fixedArr; });优化此代码优化执行效率

console.log('endTime ====> ', (new Date().getTime() - st) / 1000); return newArr; }, [res]) .then((fixedArr) => { this.proData = fixedArr; }); function getAllDates(originalData) { const allDates ...

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style type="text/css"> span{ font-size: 5em; color: red; } </style> </head> <body> 计算日期间隔 <label>请选择日期:</label><input id="d2" type="date"/> <input type="button" value="计算" id="btn"/> <script type="text/javascript"> var d2=document.getElementById("d2"); var btn=document.getElementById("btn"); var show=document.getElementById("show"); btn.onclick=function(){ var begin,end,diff; if(d2.value==""){ show.innerText="请日期选择!"; }else{ begin=now.getTime(); end=getTimeStamp(d2.vale); diff=Math.abs(begin-end)/1000/60/60/24 ; show.innerText=d1.value +"和" +d2.value+"相差"+diff+"天"; } } function getTimeStamp(dateString){ var date=new Date(dateString); return date.getTime(); } </script> </body> </html>改正

diff = Math.abs(begin - end) / 1000 / 60 / 60 / 24; show.innerText = "今天和" + d2.value + "相差" + diff + "天"; } } function getTimeStamp(dateString) { var date = new Date(dateString); return...

</style> </head> <script> var hour_box = document.querySelector('.hour') var min_box = document.querySelector('.min') var sec_box = document.querySelector('.sec') function getTime(){ var now_time =new Data() var end_time = new Date('2023-5-16 12:00:00') var time = end_time- now_time var hour =Math.floor(time/3600) var min =Math.floor((time-hour60)/60) var sec =Math.floor(time-hour3600-min*60) hour = hour < 12?'0'+hour:hour min = min < 12?'0'+min:min sec = sec < 12?'0'+sec:sec hour_box.innerText = hour min_box.innerText = min sec_box.innerText = sec } getTime() setInterval(getTime,1000) </script> <body onload="countTime()"> 京东秒杀 12:00场距结束 h : m : s </body>哪里有错

1. 第4行应该是 var now_time = new Date(); 而不是 var now_time =new Data() 2. 第5行应该是 var end_time = new Date('2023-05-16 12:00:00'); 而不是 var end_time = new Date('2023-5-16 12:00:00') 3....

public List<Mail> getMails(Date startDate, Date endDate) { long diff = endDate.getTime() - startDate.getTime(); long diffDays = diff / (24 * 60 * 60 * 1000); if (diffDays > 7) { throw new IllegalArgumentException("查询时间跨度不能超过七天"); } else { // 执行查询操作并返回结果 List<Mail> result = mailDao.getMailByDateRange(startDate, endDate); return result; } }每行加上注释

long diffDays = diff / (24 * 60 * 60 * 1000); // 如果日期范围超过七天，则抛出异常 if (diffDays > 7) { throw new IllegalArgumentException("查询时间跨度不能超过七天"); } else { // 否则执行查询...

function getDayName(input_day) { // 一天里一共的毫秒数 let oneDayTime = 1000 * 60 * 60 * 24 let today = new Date(input_day) // 若那一天是周末时，则强制赋值为7 let todayDay = today.getDay() || 7 let startDate = new Date( today.getTime() - oneDayTime * (todayDay - 1) ) let dateList = new Array() for (let i = 0; i < 7; i++) { let temp = new Date(startDate.getTime() + i * oneDayTime) let year = temp.getFullYear() let month = temp.getMonth() + 1 let day = temp.getDate() dateList[i] = ${year}-${(month < 10 ? ('0' + month) : month)}-${(day < 10 ? ('0' + day) : day)} } return dateList } 代码优化

const oneDayTime = 1000 * 60 * 60 * 24; const today = new Date(input_day); const todayDay = today.getDay() || 7; const startDate = new Date(today.getTime() - oneDayTime * (todayDay - 1)); const ...

v-if="(item.day - new Date().getTime()) * 1.0 / (1000 * 60 * 60) > 24 && (new Date().getTime()) < item.day

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disabledDate: (time) => { let nowDate = new Date() - 24 * 60 * 60 * 1000 return time.getTime() > nowDate }

new Date()) - 1000 * 60 * 60 * 24 * 1

obj[new Date(nowTime - 1000*60*60*24*i).format('MM-dd')] = nowTime - 1000*60*60*24*i;

userBook.setBackTime(new Date(userBook.getBackTime().getTime()+5*24*60*60*1000));

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obj[new Date(nowTime - 1000606024i).format('MM-dd')] = nowTime - 1000606024i;

userBook.setBackTime(new Date(userBook.getBackTime().getTime()+52460601000));