title: How can I binding an object to JS when using the WKWebview
body: <p>I met a problem.</p>
  
  <p>I replaced uiwebview with WKwebview ,but how can I pass my OC Object to JS.</p>
  
  <p>Can My object conform the JSContext protocol？</p>
  
  <p>before</p>
  
  <p><i>
  -(void)webViewDidFinishLoad:(UIWebView *)webView
  {
      [self.webView.scrollView.mj_header endRefreshing];</p>
  
  <pre><code>_jsContext = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
  _jsContext.exceptionHandler = ^(JSContext *context, JSValue *exceptionValue) {
      context.exception = exceptionValue;
      NSLog(@"%@", exceptionValue);
  };
  
  _jsContext[@"token"] = self.token;
  [self.webView stringByEvaluatingJavaScriptFromString:@"getUser()"];
  </code></pre>
  
  <p>}
  </i></p>
  
  <p>now how can I inject the Token to JS</p>