Cef3中js与C++交互（一）——窗口绑定

看了网上的一些博客和教程，还是有点迷糊。
再回头看官方文档https://bitbucket.org/chromiumembedded/cef/wiki/JavaScriptIntegration.md

还自己用例子来验证吧。
Qt工程中的目录结构，VS2017编译器（Qt用的是Qt5.14.2）


这里的文件都和之前的一样，我这里就不再赘述了，我会放到百度云上，大家下载下来看就一目了然了。
simple_app.h

#pragma once

#include "include/cef_app.h"

class SimpleApp
    : public CefApp
    , public CefBrowserProcessHandler
    , public CefRenderProcessHandler
{
   
public:
    SimpleApp(void);
    virtual ~SimpleApp() OVERRIDE;

public:
    virtual CefRefPtr<CefBrowserProcessHandler> GetBrowserProcessHandler() OVERRIDE;
    virtual CefRefPtr<CefRenderProcessHandler> GetRenderProcessHandler() OVERRIDE;
    virtual void OnContextCreated(CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame,CefRefPtr<CefV8Context> context) OVERRIDE;

protected:
    IMPLEMENT_REFCOUNTING(SimpleApp);
};

simple_app.cc

// Copyright (c) 2013 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

#include "simple_app.h"

#include <string>

#include "include/cef_browser.h"
#include "include/cef_command_line.h"
#include "include/views/cef_browser_view.h"
#include "include/views/cef_window.h"
#include "include/wrapper/cef_helpers.h"
#include "simple_handler.h"

SimpleApp::SimpleApp() {
   }

SimpleApp::~SimpleApp()
{
   

}

CefRefPtr<CefBrowserProcessHandler> SimpleApp::GetBrowserProcessHandler()
{
   
    return this;
}

CefRefPtr<CefRenderProcessHandler> SimpleApp::GetRenderProcessHandler()
{
   
    return this;
}

void SimpleApp::OnContextCreated(CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame, CefRefPtr<CefV8Context> context)
{
   
    // The var type can accept all object or variable
    CefRefPtr<CefV8Value> window = context->GetGlobal();

    // bind value into window[or you can bind value into window sub node]
    CefRefPtr<CefV8Value> strValue = CefV8Value::CreateString("say yes");
    window->SetValue("say_yes", strValue, V8_PROPERTY_ATTRIBUTE_NONE);
}

simple_handler.h

// Copyright (c) 2013 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

#ifndef CEF_TESTS_CEFSIMPLE_SIMPLE_HANDLER_H_
#define CEF_TESTS_CEFSIMPLE_SIMPLE_HANDLER_H_

#include "include/cef_client.h"

#include <list>

class SimpleHandler : public CefClient,
                      public CefDisplayHandler,
                      public CefLifeSpanHandler,
                      public CefLoadHandler {
   
 public:
  explicit SimpleHandler(bool use_views);
  ~SimpleHandler();

  // Provide access to the single global instance of this object.
  static SimpleHandler* GetInstance();

  // CefClient methods:
  virtual CefRefPtr<CefDisplayHandler> GetDisplayHandler() OVERRIDE {
   
    return this;
  }
  virtual CefRefPtr<CefLifeSpanHandler> GetLifeSpanHandler() OVERRIDE {
   
    return this;
  }
  virtual CefRefPtr<CefLoadHandler> GetLoadHandler() OVERRIDE {
    return this;