问如何启用API 15的javascript webview

EN

public class MainActivity extends AppCompatActivity {
private WebView view;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    view = (WebView) this.findViewById(R.id.webView);
    view.getSettings().setJavaScriptEnabled(true);
    view.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
    view.setWebViewClient(new MyBrowser());
    view.loadUrl("http://mywebsite.com");
}

private class MyBrowser extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}

public boolean onKeyDown(int keyCode, KeyEvent event) {

    if ((keyCode == KeyEvent.KEYCODE_BACK) && view.canGoBack()) {
        view.goBack(); 
        return true;
    }
    return super.onKeyDown(keyCode, event);
}
}