js.zip_c计时器_正计时_计时_计时器_计时器正计时资源-CSDN下载

共19个文件

h：4个

cpp：3个

exe：1个

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110 浏览量 2022-09-24 16:08:57 上传评论收藏 37KB ZIP 举报

在JavaScript编程语言中，计时器是一个非常常用的功能，它被广泛应用于网页动态效果、游戏、数据刷新等场景。在给定的“js.zip_c 计时器_正计时_计时_计时器_计时器正计时”压缩包中，我们可以推断出这是一个关于JavaScript实现的计时器程序，它不仅支持传统的倒计时功能，还支持正计时（即从零开始递增计时），并且用户可以调整计时的速度，提供了更多的灵活性。在JavaScript中，计时器主要通过`setTimeout()`和`setInterval()`这两个函数来实现。`setTimeout()`用于执行一次性的延时任务，而`setInterval()`则用于周期性地重复执行某任务。在这个计时器应用中，可能包含以下核心知识点： 1. **延时与定时**：`setTimeout(fn, delay)`用于在指定的延迟毫秒后执行函数fn。`delay`参数决定等待的时间，单位是毫秒。例如，`setTimeout(function() {console.log('Hello');}, 2000)`将在2秒后打印“Hello”。 2. **周期执行**：`setInterval(fn, interval)`则会在每间隔`interval`毫秒后持续调用函数fn。例如，`setInterval(function() {console.log('Tick!');}, 1000)`会每秒打印一次“Tick!”。 3. **清除计时器**：为了在某些情况下停止计时器，我们需要使用`clearTimeout()`或`clearInterval()`。例如，`clearTimeout(id)`或`clearInterval(id)`，其中id是`setTimeout()`或`setInterval()`返回的唯一标识符。 4. **正计时与倒计时**：正计时从0开始向上计数，而倒计时则是从一个设定的值开始向下计数。实现这两种计时通常需要一个计时变量，随着时间的推移不断更新，并在达到预定条件时触发相应的操作。 5. **速度控制**：在描述中提到的“可以调节计时快慢”，这可能通过改变`setInterval()`的间隔时间`interval`实现。例如，如果用户希望计时器更快，可以减少间隔时间；反之，增加间隔时间会使计时器变慢。 6. **用户交互**：计时器通常与用户界面（UI）相结合，显示当前的计时状态。这可能涉及到DOM操作，如更新HTML元素的文本或CSS样式。 7. **事件处理**：JavaScript的事件监听和处理机制在此类应用中也十分重要。例如，可能有开始、暂停、重置等按钮，每个按钮的点击事件都需要关联相应的计时器操作。 8. **异常处理**：在编写计时器功能时，应考虑到可能的异常情况，如用户在计时过程中关闭页面或浏览器，此时需要确保资源的正确释放和状态的保存。 9. **代码结构**：从压缩包中的文件名来看，项目可能采用MFC（Microsoft Foundation Classes）框架开发，这是C++的一个库，用于构建Windows应用程序。`*.cpp`和`*.h`文件通常对应C++的源代码和头文件，而`.dsp`和`.dsw`文件是Visual Studio的项目文件，`.exe`是编译后的可执行程序。 10. **用户界面设计**：`ex17Dlg.cpp`和`ex17Dlg.h`可能是关于对话框（Dialog）类的实现，对话框通常包含计时器的显示和控制元素，如文本框显示时间、按钮等。这个压缩包内的程序很可能是一个基于JavaScript的计时器应用，具备正计时和倒计时功能，并且支持用户自定义计时速度。通过解析和理解这些文件，我们可以学习到JavaScript计时器的实现原理，以及如何结合C++和MFC进行Windows应用程序开发。

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js.zip （19个子文件）

ex17Dlg.cpp 7KB

ex17.h 1KB

ex17Dlg.h 2KB

res

ex17.rc2 396B

ex17.ico 1KB

ex17.clw 2KB

ex17.opt 54KB

ex17.rc 6KB

ex17.plg 924B

ex17.aps 35KB

ex17.exe 108KB

StdAfx.cpp 206B

ex17.cpp 2KB

resource.h 1KB

ex17.dsw 533B

StdAfx.h 1KB

ex17.ncb 57KB

ex17.dsp 4KB

ReadMe.txt 3KB

======================================================================== MICROSOFT FOUNDATION CLASS LIBRARY : ex17 ======================================================================== AppWizard has created this ex17 application for you. This application not only demonstrates the basics of using the Microsoft Foundation classes but is also a starting point for writing your application. This file contains a summary of what you will find in each of the files that make up your ex17 application. ex17.dsp This file (the project file) contains information at the project level and is used to build a single project or subproject. Other users can share the project (.dsp) file, but they should export the makefiles locally. ex17.h This is the main header file for the application. It includes other project specific headers (including Resource.h) and declares the CEx17App application class. ex17.cpp This is the main application source file that contains the application class CEx17App. ex17.rc This is a listing of all of the Microsoft Windows resources that the program uses. It includes the icons, bitmaps, and cursors that are stored in the RES subdirectory. This file can be directly edited in Microsoft Visual C++. ex17.clw This file contains information used by ClassWizard to edit existing classes or add new classes. ClassWizard also uses this file to store information needed to create and edit message maps and dialog data maps and to create prototype member functions. res\ex17.ico This is an icon file, which is used as the application's icon. This icon is included by the main resource file ex17.rc. res\ex17.rc2 This file contains resources that are not edited by Microsoft Visual C++. You should place all resources not editable by the resource editor in this file. ///////////////////////////////////////////////////////////////////////////// AppWizard creates one dialog class: ex17Dlg.h, ex17Dlg.cpp - the dialog These files contain your CEx17Dlg class. This class defines the behavior of your application's main dialog. The dialog's template is in ex17.rc, which can be edited in Microsoft Visual C++. ///////////////////////////////////////////////////////////////////////////// Other standard files: StdAfx.h, StdAfx.cpp These files are used to build a precompiled header (PCH) file named ex17.pch and a precompiled types file named StdAfx.obj. Resource.h This is the standard header file, which defines new resource IDs. Microsoft Visual C++ reads and updates this file. ///////////////////////////////////////////////////////////////////////////// Other notes: AppWizard uses "TODO:" to indicate parts of the source code you should add to or customize. If your application uses MFC in a shared DLL, and your application is in a language other than the operating system's current language, you will need to copy the corresponding localized resources MFC42XXX.DLL from the Microsoft Visual C++ CD-ROM onto the system or system32 directory, and rename it to be MFCLOC.DLL. ("XXX" stands for the language abbreviation. For example, MFC42DEU.DLL contains resources translated to German.) If you don't do this, some of the UI elements of your application will remain in the language of the operating system. /////////////////////////////////////////////////////////////////////////////

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