Javascript five function call methods, this represents

1. Call A method (the so-called method is A member function in the class, that is, the method). Call:. a (); If method a has this, this points to Class A 2. function call (normal function), call: a (); If method a has this, this is a super global variable pointing to the window... syntaxHighlighter. al 1. method call (the so-called method is A member function in the class, that is, the method). Call:. a (); If method a has this, this points to Class A 2. function call (normal function), call: a (); If method a has this, this is a super global variable pointing to the window object 3. constructor call (object initialization method), call: new a (); If method a contains this, then this is bound to prototype of A's prototype. A is an object, and method a is A method in method a. 4. call. call:. call (); the call method has a specified parameter, that is, the first parameter is the object to which this is bound. a is a method, if a has multiple parameters, it is called as follows:. call (objThis, param1, param2 ,.........); 5. apply call. Call:. apply (); The apply method has a specified parameter, that is, the first parameter is the object to which this is bound. a is a method, if a has multiple parameters, it is called as follows:. apply (objThis, [param1, param2, param3. ......]); ps: The difference between call and apply: Yes. If a method has multiple parameters, call lists the parameters one by one, and apply Concatenates the parameters into an array for calling.