如何從函數中訪問javascript對象？

Question

比方說，我有：

var test = {}; 
test.Data1 = { 
    ...JSON objects here... 
}; 
test.Data2 = { 
    ...JSON objects here... 
}; 
and so on... 

我通常訪問這些JSON對象後面一組的呼叫：

this.scope.testData = test['Data1']; 

然而，可以對測試數據越來越大，所以我只是想通過無論數據我想要的功能，並做如下處理：

this.scope.setupData = function(data) 
{ 
    var fData = test[data]; // is this line correct? 
    ... 
    ... 
    return fData; 

}; 

但它不工作。我得到：不能將屬性「fData」未定義爲「[object Object]」...我是新來的javaScript，任何幫助將不勝感激。

Answer 1

問題是this.scope.setupData內的範圍。要訪問變量涉及到this.scope您需要再次使用this：

/** 
* At current scope, "this" refers to some object 
* Let's say the object is named "parent" 
* 
* "this" contains a property: "scope" 
*/ 
this.scope.setupData = function(data) 
{ 
    /** 
    * At current scope, "this" refers to "parent.scope" 
    * 
    * "this" contains "setupData" and "testData" 
    */ 
    var fData = this.testData[data]; // is this line correct? 
    ... 
    ... 
    return fData; 
};