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c执行js代码

用JavaScript执行代码：该文介绍了在C语言中 执行JS代码的方法，包括初始化项目、引入库、创建摘要函数、调用函数及输出结果等步骤，并提供了相应的代码示例。

在C语言中执行JavaScript代码，通常需要借助特定的工具或库来实现，以下是几种常见的方法：

1、使用Emscripten

原理：Emscripten是一个将C/C++代码编译成WebAssembly（Wasm）或直接生成JavaScript代码的工具链，通过这种方式，可以将C代码转换为可以在浏览器环境中运行的JavaScript代码，从而实现在C中执行JavaScript的功能。

示例：以一个简单的“Hello World”程序为例，首先需要安装Emscripten SDK，然后编写C代码如下：

 #include <emscripten.h>
     #include <stdio.h>
     int main() {
         EM_ASM({ alert('hello from C!'); });
         return 0;
     }

使用以下命令进行编译：

 emcc test.c -o test.html -s WASM=0

编译后会生成一个包含HTML、JavaScript和相关资源的文件夹，在浏览器中打开生成的test.html文件，就可以看到弹出的“hello from C!”提示框。

c执行js代码

2、通过Node.js的Child Processes模块

原理：Node.js提供了强大的子进程管理功能，可以在C语言程序中启动一个子进程来执行JavaScript代码，通过与子进程进行通信，可以实现数据的传递和交互。

示例：假设有一个名为script.js的JavaScript文件，内容如下：

 console.log('This is a JavaScript script');

在C语言程序中，可以使用以下代码来执行该JavaScript文件：

c执行js代码

 #include <stdio.h>
     #include <stdlib.h>
     #include <string.h>
     #include <unistd.h>
     #include <sys/wait.h>
     int main() {
         char* args[3];
         args[0] = "node";
         args[1] = "script.js";
         args[2] = NULL;
         pid_t pid = fork();
         if (pid == 0) {
             execvp("node", args);
             exit(EXIT_FAILURE);
         } else if (pid > 0) {
             int status;
             waitpid(pid, &status, 0);
             if (WIFEXITED(status)) {
                 printf("JavaScript script executed with exit status %d
", WEXITSTATUS(status));
             }
         } else {
             perror("fork");
             exit(EXIT_FAILURE);
         }
         return 0;
     }

上述代码中，使用fork函数创建子进程，然后在子进程中使用execvp函数执行node命令来运行script.js文件，父进程等待子进程执行完成后，获取其退出状态并打印。

3、利用ActiveXObject（仅限IE浏览器）

原理：在Internet Explorer浏览器中，可以通过ActiveXObject对象来调用JavaScript代码，这种方法需要在Windows平台上运行，并且依赖于IE浏览器的支持。

示例：以下是一个在C++中使用ActiveXObject调用JavaScript的示例代码：

c执行js代码

 #import "mshtml.dll" no_namespace rename("GetTypeInfoCount", "GetTypeInfoCountEx")
     #include <iostream>
     using namespace std;
     int main() {
         CoInitialize(NULL);
         IHTMLDocument2* pDoc;
         HRESULT hr = CoCreateInstance(CLSID_HTMLDocument, NULL, CLSCTX_INPROC_SERVER, IID_IHTMLDocument2, (void**)&pDoc);
         if (SUCCEEDED(hr)) {
             IDispatch* pDisp;
             pDoc->get_Script(&pDisp);
             DISPID dispid;
             pDisp->GetIDsOfName(L"eval", &dispid);
             VARIANT result;
             VARIANT params[1];
             params[0].vt = VT_BSTR;
             params[0].bstrVal = SysAllocString(L"alert('Hello from C++');");
             DISPPARAMS dispparams = { params, NULL, 1, 1 };
             pDisp->Invoke(dispid, IID_NULL, LOCALE_SYSTEM_DEFAULT, DISPATCH_METHOD, &dispparams, &result, NULL, NULL);
             VariantClear(&result);
             SysFreeString(params[0].bstrVal);
             pDisp->Release();
         }
         pDoc->Release();
         CoUninitialize();
         return 0;
     }

上述代码首先初始化COM库，然后创建一个HTMLDocument对象，并通过该对象的Script属性获取脚本引擎的IDispatch接口，使用GetIDsOfName函数获取eval函数的DISPID，最后使用Invoke函数调用eval函数来执行JavaScript代码。

4、通过WebView组件（如CEF）

原理：CEF（Chromium Embedded Framework）是一个开源的项目，用于在应用程序中嵌入Chromium浏览器内核，通过CEF提供的WebView组件，可以在C++应用程序中加载和执行网页，包括其中的JavaScript代码。

示例：以下是一个使用CEF的简单示例，展示如何在C++中加载一个包含JavaScript的网页：

 #include "include/cef_app.h"
     #include "include/wrapper/cef_helpers.h"
     #include "include/cef_browser.h"
     #include "include/cef_client.h"
     #include "include/cef_render_process_handler.h"
     #include "include/cef_life_span_handler.h"
     #include "include/cef_display_handler.h"
     #include "include/cef_frame.h"
     #include "include/cef_request_context_handler.h"
     #include "include/cef_resource_bundle_handler.h"
     #include "include/cef_resource_handler.h"
     #include "include/cef_resource_request_handler.h"
     #include "include/cef_scheme_handler.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin.h"
     #include "include/cef_web_plugin_delegate.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef_web_plugin_info.h"
     #include "include/cef_web_plugin_manager.h"
     #include "include/cef_web_plugin_unstable_callback.h"
     #include "include/cef_web_plugin_geolocation_permission_context.h"
     #include "include/cef/browser/prefs/pref_service.h"
     class SimpleHandler : public CefClient, public CefLifeSpanHandler, public CefLoadHandler, public CefDisplayHandler { public: CefRefPtr<CefBrowser> browser; CefRefPtr<CefFrame> frame; }; int main(int argc, char* argv[]) { CefMainArgs mainArgs(argc, argv); int exitCode = CefExecuteProcess(mainArgs, nullptr, nullptr); if (exitCode >= 0) return exitCode; CefSettings settings; CefInitialize(mainArgs, settings, app, nullptr); CefWindowInfo windowInfo; CefBrowserHost::CreateBrowser(windowInfo, new SimpleHandler(), "http://www.example.com", CefBrowserSettings(), nullptr, nullptr); CefRunMessageLoop(); CefShutdown(); return 0; } ```
c语言javascript执行

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