Use hidden new to create object _ jquery

JQuery. Event class found in JQ. The author is estimated to reduce the amount of code. Defines a class, but does not use the new keyword to create this class object. Instead, you can use method call () to create this object. In most cases, we write classes like this and then use new to create objects.

The Code is as follows:

Function Person (name, age ){
This. name = name;
This. age = age;
}
Person. prototype = {
SetName: function (n) {this. name = n ;},
GetName: function () {return this. name ;}
}
Var p = new Person ('jack', 25 );

Changed to this

The Code is as follows:

Function Person (name, age ){
// Change the condition to (this = window), (this = self), or (this. constructor! = Object)
If (! This. setName ){
Return new Person (name, age );
}
This. name = name;
This. age = age;
}
Person. prototype = {
SetName: function (n) {this. name = n ;},
GetName: function () {return this. name ;}
}
Var p = Person ('jack', 25 );

Note that this class has the following more than the top write class method:

The Code is as follows:

If (! This. setName ){
Return new Person (name, age );
}

Well, the method for creating an instance (object) of the class is also changed to the following:

The Code is as follows:

Var p = Person ('jack', 25 );

This method of creation (function call) is less "new _", "new", and "space" than above, and is actually new in the class. In this way, you can reduce the number of bytes each time you create an object.
If you replace the if condition in the class with an attribute on a non-prototype, for example, this. name. The program prompts an error: too much recursion

The Code is as follows:

Function Person (name, age ){
If (! This. name ){
Return new Person (name, age );
}
This. name = name;
This. age = age;
}
Person. prototype = {
SetName: function (n) {this. name = n ;},
GetName: function () {return this. name ;}
}
Var p = Person ('jack', 25 );