The main disadvantage of lazy initialization is your code becomes more complex because you need to check to see if the attribute has been defined yet and, if not, obtain its value.
延迟初始化的主要弊端是，由于要查看属性是否已定义，如果没有，则得到它的值，这会使代码变得更复杂。
2
The main disadvantage of lazy initialization is that your code becomes more complex because you need to check to see if the attribute has been defined yet and, if not, obtain its value.
On the next screen, enter the Initialization Parameters SECRET_KEY and the value as the secret key in our initial steps of Facebook application creation.