Ray's playground

摘要： There are four patterns of invocation in JavaScript: the method invocation pattern, the function invocation pattern, the constructor invocation pattern, and the apply invocation pattern. The patterns ... 阅读全文

摘要： The undefined value is produced if an attempt is made to retrieve a nonexistent member:　　Attempting to retrieve values from undefined will throw a TypeError exception. This can be guarded against with... 阅读全文