我有下面的代碼部分:爲什麼不工作條件?
var SocketChat = socketFactory({
ioSocket: (typeof io === 'undefined') ? io.connect('http://test.com:8181') : null
});
我嘗試檢查是否存在io
對象爲:
(typeof io === 'undefined')
,但我得到的錯誤ReferenceError: io is not defined
仍然
讀[這](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Operators/Conditional_Operator) – Lucius