Icefaces如何在JavascriptContext中添加多个调用？

要运行多个呼叫，我知道我可以这样做：

String call1 = "doSomething1();";
String call2 = "doSomething2();";
JavascriptContext.addJavascriptCall(currentInstance, call1 + call2);

但我想独立添加呼叫，类似这样：

String call1 = "doSomething1();";
JavascriptContext.addJavascriptCall(currentInstance, call1);
...
String call2 = "doSomething2();";
JavascriptContext.addJavascriptCall(currentInstance, call2);

当我这样做的时候，它不起作用。有什么想法吗