flutter webview_flutter 设置cookies

  WebViewController _controller;
      onWebViewCreated: (WebViewController wvc) {
        _controller = wvc;
    }

     onPageFinished: (String value) {
     _controller.evaluateJavascript( 'document.cookie = "SESSIONID=612bc4822b6996d6f335a963c20eb541fba72985; path=/"')
    }

设置cookies需要注意时机，这里是在页面加载完成后才设置cookie