JavaScript對象/數組訪問問題

Question

用一些數據設置一個對象。

var blah = {}; 
blah._a = {}; 
blah._a._something = '123'; 

然後希望嘗試和訪問，我該如何去正確地做到這一點？

var anItem = 'a'; 
console.log(blah._[anItem]); 
console.log(blah._[anItem]._something); 

Answer 1

的bracket notation應該是這樣的：

var anItem = 'a'; 
console.log(_glw['_'+anItem]); 
console.log(_glw['_'+anItem]._something); 

You can test it here（注意，我在演示代替_glw與blah以匹配原始對象）。

Answer 2

不知道我明白這個問題，但這裏有一些基礎知識。

var foo = {}; 

// These two statements do the same thing 
foo.bar = 'a'; 
foo['bar'] = 'a'; 

// So if you need to dynamically access a property 
var property = 'bar'; 
console.log(foo[property]); 

Answer 3

var obj = {}; 
obj.anotherObj = {}; 
obj.anotherObj._property = 1; 
var item = '_property'; 
// the following lines produces the same output 
console.log(obj.anotherObj[item]); 
console.log(obj.anotherObj['_property']); 
console.log(obj.anotherObj._property);