1, in the object method, this refers to the object call it method,

2, the use of this alone, it refers to the Global object (Global),

3, the function USES, this belongs to the function,

4, strict mode function is not bound to this, then this is undefined,

5, in the HTML event handlers, this point to the receive events HTML element,

6, the apply and the call to allow switching function execution context (context), namely this binding object, this can be reference to any object,