[英]How do I reference an object dynamically?
In Javascript, I have an object: 在Javascript中,我有一个对象:
obj = { one: "foo", two: "bar" };
Now, I want do do this 现在,我想要做到这一点
var a = 'two';
if(confirm('Do you want One'))
{
a = 'one';
}
alert(obj.a);
But of course it doesn't work. 但当然它不起作用。 What would be the correct way of referencing this object dynamically?
动态引用此对象的正确方法是什么?
short answer: obj[a]
简短回答:
obj[a]
long answer: obj.field
is just a shorthand for obj["field"]
, for the special case where the key is a constant string without spaces, dots, or other nasty things. 很长的答案:
obj.field
只是obj["field"]
的简写,对于特殊情况,键是一个没有空格,圆点或其他令人讨厌的东西的常量字符串。 in your question, the key wasn't a constant, so simply use the full syntax. 在你的问题中,键不是常量,所以只需使用完整的语法。
像这样:
obj[a]
As a side note, global variables are attached to the "window" object, so you can do 作为旁注,全局变量附加到“窗口”对象,因此您可以这样做
var myGlobal = 'hello';
var a = 'myGlobal';
alert(window[a] + ', ' + window.myGlobal + ', ' + myGlobal);
This will alert "hello, hello, hello" 这会警告“你好,你好,你好”
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