V8中的Javascript等效项？

Silviu-Marian 发表于 Dev

西尔维·玛丽安

我正在尝试使用NodeJS和V8来学习两者。

我想用C ++翻译这个简单的JS行。

global.Game = { sleep: call_some_CPP_function };

在过去的两天里，我一直将Internet和其他人的源代码中的代码拼凑在一起，试图了解它的工作原理，除非最终我没有太多。

下面的代码不起作用，如果执行a console.log(global.Game)，我什么也没得到。

#include "node.h"
#include "v8.h"

namespace node{

    using namespace v8; // make life easier

    // define a sleepy thread blocker
    Handle<Value> call_some_CPP_function(const FunctionCallbackInfo<Value>& a){
        HandleScope scope(node_isolate);
        Sleep(3);
        return scope.Close(Undefined());
    }

    // let's create the object here
    // I'm calling this function elsewhere 
    void execme(){

        // I've read somewhere that I have to do this
        Locker locker(node_isolate);
        HandleScope scope(node_isolate);

        // I think these two set the execution context (variables) and "this" accordingly 
        // but I'm not sure
        Local<Context> context = node_isolate->GetCurrentContext();
        Context::Scope context_scope(context);

        // I need a reference to the global object, to assign my "Game" object
        Local<Object> global = node_env->context()->Global();

        // The only way is to invent a constructor for it
        Local<FunctionTemplate> function_template = FunctionTemplate::New();
        function_template->SetClassName(String::New("GameClass"));

        // and create a new instance using that constructor
        Local<Object> game_object = function_template->GetFunction()->NewInstance();

        // after that, add the "sleep" function, which executes the function above
        NODE_SET_METHOD(game_object, "sleep", call_some_CPP_function); 

        // and finally do the global.Game assignment
        global->Set(String::New("Game"), game_object);
    }

}

湿帽

game.cc

#include <node.h>
#include <v8.h>

using namespace v8;

// sleep 3 seconds
Handle<Value> Sleep(const Arguments& args) {
  HandleScope scope;
  Sleep(3000);
  return scope.Close(Undefined());
}

void init(Handle<Object> exports) {
  exports->Set(String::NewSymbol("sleep"),
      FunctionTemplate::New(Sleep)->GetFunction());
}

NODE_MODULE(game, init)

app.js

global.Game = require('./build/Release/game');

console.log(global.Game); // this will print "{ sleep: [Function] }"

//now you can call native sleep
Game.sleep();

文件：http : //nodejs.org/api/addons.html#addons_hello_world

本文收集自互联网，转载请注明来源。

如有侵权，请联系[email protected] 删除。