小编Sya*_*r S的帖子

我需要实现一个调用Web服务并返回响应的函数.

我试过了

public String getFolderJson(String path) {  
           String result="initial_value";
           StringBuilder param = new StringBuilder();  
           param.append("?sessionId=").append(getSessionId());  
           param.append("&path=").append(path);  
           RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, "https://localhost/folder" + param);  
                   try {  
                        builder.sendRequest(null, new RequestCallback() {  
                        @Override  
                        public void onResponseReceived(Request request,
                                Response response) {  
                              result = response.getText();
                              System.out.println(response.getText());  
                                            //I need to return "result"   
                        }  
                        @Override  
                        public void onError(Request request, Throwable exception) {}  
                          });  
                    return result; //the result get returned before the response is recieved.So i am getting the return value "initial_value".
                   }      
                   catch (RequestException e) {} …

我正在创建一个chrome扩展.我不知道如何使用变量作为chrome.storage.local.set()功能的关键.我试过了

var key = 'myKey';
chrome.storage.local.get(key, function(val) { 
    chrome.storage.local.set({key:val[key]+param1}); //appending  param1
    alert(val[key]);
}

在这里,我试图获取值val[key]并附加一个字符串,param1并使用相同的密钥将其放回存储.但我无法这样做.警报框始终显示未定义.

但是当我尝试没有变量时key,它工作正常.

chrome.storage.local.get('myKey', function(val) { 
    chrome.storage.local.set({myKey:val['myKey']+param1}); //appending  param1
    alert(val['myKey']);
}

问题是我使用chrome.storage.local.set的不仅是字符串而且还有对象的参数.