我在考试页面上实现了计时器计数。就像edmodo website一样。但是当你在edmodo上参加考试时，即使你刷新它，计时器仍在计算中。在我的网站上，如果刷新页面，计时器也会刷新。我想要的就像edmodo，即使你刷新页面仍然可以计算。请参阅我的代码以供参考。
注意：的 我正在使用Laravel5.1 / jQuery
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using static testdesktopicons.DesktopManager;
namespace testdesktopicons
{
class Program
{
static void Main(string[] args)
{
//DesktopManager.SetWallpaper(DesktopManager.Style.Stretched);
DesktopManager.ToggleDesktopIcons();
//DesktopManager.SetTaskbarState(AppBarStates.AutoHide);
}
}
public static class DesktopManager
{
const int SPI_SETDESKWALLPAPER = 20;
const int SPIF_UPDATEINIFILE = 0x01;
const int SPIF_SENDWININICHANGE = 0x02;
private const int WM_COMMAND = 0x111;
private const int SW_HIDE = 0;
private const int SW_SHOW = 1;
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr GetWindow(IntPtr hWnd, GetWindow_Cmd uCmd);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
//static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);
//[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", SetLastError = true)]
private static extern bool GetWindowInfo(IntPtr hwnd, ref WINDOWINFO pwi);
//for taskbar hide
[DllImport("user32.dll")]
private static extern int ShowWindow(int hwnd, int command);
[DllImport("user32.dll")]
public static extern int FindWindowEx(int parentHandle, int childAfter, string className, int windowTitle);
[DllImport("user32.dll")]
private static extern int GetDesktopWindow();
//auto hide taskbar
public enum GetWindow_Cmd : uint
{
GW_HWNDFIRST = 0,
GW_HWNDLAST = 1,
GW_HWNDNEXT = 2,
GW_HWNDPREV = 3,
GW_OWNER = 4,
GW_CHILD = 5,
GW_ENABLEDPOPUP = 6
}
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
private int _Left;
private int _Top;
private int _Right;
private int _Bottom;
}
[StructLayout(LayoutKind.Sequential)]
struct WINDOWINFO
{
public uint cbSize;
public RECT rcWindow;
public RECT rcClient;
public uint dwStyle;
public uint dwExStyle;
public uint dwWindowStatus;
public uint cxWindowBorders;
public uint cyWindowBorders;
public ushort atomWindowType;
public ushort wCreatorVersion;
public WINDOWINFO(Boolean? filler)
: this() // Allows automatic initialization of "cbSize" with "new WINDOWINFO(null/true/false)".
{
cbSize = (UInt32)(Marshal.SizeOf(typeof(WINDOWINFO)));
}
}
[StructLayout(LayoutKind.Sequential)]
public struct APPBARDATA
{
public UInt32 cbSize;
public IntPtr hWnd;
public UInt32 uCallbackMessage;
public UInt32 uEdge;
public Rectangle rc;
public Int32 lParam;
}
static bool AreIconsVisible()
{
IntPtr hWnd = GetWindow(GetWindow(FindWindow("Progman", "Program Manager"), GetWindow_Cmd.GW_CHILD), GetWindow_Cmd.GW_CHILD);
WINDOWINFO info = new WINDOWINFO();
info.cbSize = (uint)Marshal.SizeOf(info);
GetWindowInfo(hWnd, ref info);
return (info.dwStyle & 0x10000000) == 0x10000000;
}
public static void ToggleDesktopIcons()
{
Console.WriteLine("toggle desktop");
Console.WriteLine("Icons are visible" + AreIconsVisible());
var toggleDesktopCommand = new IntPtr(0x7402);
IntPtr hWnd = GetWindow(FindWindow("Progman", "Program Manager"), GetWindow_Cmd.GW_CHILD);
SendMessage(hWnd, WM_COMMAND, toggleDesktopCommand, IntPtr.Zero);
Console.ReadLine();
}
}
}
$(document).ready(function() {
// Quiz timer (Start of Quiz)
var quiz_timer = $('.quiz-timer').html();
var exact_time = parseInt($('.timer-value').html() - 1);
var hrs_to_spend = parseInt(exact_time / 60);
var mins_to_spend = parseInt(exact_time % 60);
var secs_to_spend = 60;
var timeIsUp = false;
var secs = 0,
mins = 0,
hrs = 0;
var secs_zero, mins_zero, hrs_zero, h_spend_zero, m_spend_zero, s_spend_zero;
var setters = setInterval(function() {
if ($('.quiz-timer').html() != '00:00:01') {
if (secs_to_spend > 0) {
secs_to_spend--;
}
if (secs_to_spend <= 0) {
mins_to_spend--;
secs_to_spend = 59;
}
if (mins_to_spend < 0) {
hrs_to_spend--;
mins_to_spend = 59;
}
} else {
$('.quiz-timer').html('00:00:00')
clearInterval(setters);
$('.answer-quiz > .panel-info').attr('class', 'panel panel-danger');
swal({
title: "Oops!",
text: "Time is up.",
type: "warning"
});
timeIsUp = true;
setTimeout(function() {
$('#submitAttempt').click();
}, 2000);
return false;
}
h_spend_zero = (hrs_to_spend < 10) ? '0' : '';
m_spend_zero = (mins_to_spend < 10) ? '0' : '';
s_spend_zero = (secs_to_spend < 10) ? '0' : '';
$('.quiz-timer').html(h_spend_zero + hrs_to_spend + ':' + m_spend_zero + mins_to_spend + ':' + s_spend_zero + secs_to_spend);
if (!timeIsUp) {
secs++;
if (secs == 60) {
mins++;
secs = 0;
}
if (mins == 60) {
hrs++;
mins = 0;
}
hrs_zero = (hrs < 10) ? '0' : '';
mins_zero = (mins < 10) ? '0' : '';
secs_zero = (secs < 10) ? '0' : '';
$('#timeTaken').val(hrs_zero + hrs + ':' + mins_zero + mins + ':' + secs_zero + secs);
}
}, 1000);
});
答案 0 :(得分：0)
将时间到期截止日期设为日期时间。计算剩余时间，而不是花时间。
例如，如果现在的日期时间是＆＃34; 2017-08-22 08：00：01＆＃34; （考试的开始时间），并且您希望在1小时后到期，将日期时间截止日期设置为＆＃34; 2017-08-22 09：00：01＆＃34; （这应该从服务器返回）。然后让javascript计数器每秒以刷新率（间隔）重新计算现在时间和截止时间之间的差异。
答案 1 :(得分：0)
使用本地存储空间
1）将最后一次保存在localstorage中 喜欢
window.onbeforeunload= function(){
localStorage.setItem("lastTime", timevalue);
}
2）如果在localstorage中存在时间，则重新加载，如
savedTime = localStorage.getItem("lastTime");
mytimer.continueFrom(savedTime)
从那时起拿起并继续计时器
看看这里有关localstorage的信息 Local Storage
答案 2 :(得分：0)
您无法通过Javascript实现此目标，javascript代码具有会话生命周期，如果您关闭该标签，它会终止该标签使用的所有资源，包括javascript。
您可以尝试通过在local storage中保存计数器+当前时间来克服这个问题，并且每当您启动JS代码时，检查本地存储中是否存在这些值，并使用它们初始化计数器值。
let counter = prevSavedCounter + (new Date()).getTime() - savedTime;