Function quantity. It is applicable to functions that are only used once and do not need to be named. In the following example, although there is a fact function name, the latter is only used for self-calling.
Copy codeThe Code is as follows:
Var f = function (x)
{
Return x * x;
}
Var f = function fact (x)
{
If (x <= 1) return 1;
Else return x * fact (x-1 );
};
Parameter array of the function: Arguments object. Common arguments [I] References, arguments. length, etc.
Object:
Methods In object definition (function) are actually a function. The difference with nested functions is that object entities are referenced by the keyword "this.
Copy codeThe Code is as follows:
Function Rectangle (w, h)
{
This. width = w;
This. height = h;
This. area = area;
This. enlarge = Rectangle_enlarge;
This. setSize = setSize;
// Use the constructor to define a method
Function Rectangle_enlarge ()
{
This. width * = 2;
This. height * = 2;
}
Function setSize (width, height)
{
If (arguments. length <2)
{
Throw new Error ("arguments less! ");
}
Else if (arguments. length> = 2)
{
This. width = width;
This. height = height;
}
}
Function area ()
{
Return (this. width * this. height );
}
Function area1 ()
{
Alert (10 );
}
}
Prototype objects and inheritance:
A prototype object is an ideal place for storing methods and other common sense attributes, which is equivalent to a static field in C.