cef注入js文件

思路很简单，在页面加载完成时，执行以下JS代码即可：

var v = document.createElement('script');

 v.src='http://127.0.0.1:9526/cef.js';

 document.body.appendChild(v);

cef.js文件内容：

alert('hello cef.js');

// 具体实现代码如下，重载OnLoadEnd即可
class SimpleHandler : public CefClient,
                      public CefDisplayHandler,
                      public CefLifeSpanHandler,
                      public CefLoadHandler {
 public:
  SimpleHandler();
  ~SimpleHandler();

  // ...



  virtual void OnLoadEnd(CefRefPtr<CefBrowser> browser,
    CefRefPtr<CefFrame> frame,
    int httpStatusCode) OVERRIDE
  {
    frame->ExecuteJavaScript("alert('OnLoadEnd');", frame->GetURL(), 0);
    const CefString js = "var v = document.createElement('script');v.src='http://127.0.0.1:9526/cef.js';document.body.appendChild(v);";
    frame->ExecuteJavaScript(js, frame->GetURL(), 0);
  }


  // ....