The JavaScript valueOf () function is detailed

valueOf()function to return the original value of the specified object .

This method belongs Object to an object, and since all objects have "inherited" an object instance, this method can be used by almost all instance objects.

This function is supported by all major browsers.

Grammar

Object.  ValueOf()   

return value

valueOf()The function returns the original value of the specified object.

Many of the built-in objects of JavaScript rewrite the function to make it more suitable for its own functional needs. Therefore, methods of different types valueOf() of objects can have different return and return value types.

Object	return value
Array	An array instance object.
Boolean	Boolean value.
Date	The time value stored in milliseconds, calculated from midnight UTC January 1, 1970.
Function	function itself.
Number	numeric value.
Object	The object itself. This is the default setting.
String	The string value.

Example & Description

Array: Returns the Arrays object itself
VarArray= ["Codeplayer", True, 12, -5];
Document.Writeln(Array.ValueOf() ===Array); True

Date: Current time in milliseconds from midnight January 1, 1970
VarDate= New Date(2013, 7, 18, 23, 11, 59, 230);
Document.Writeln(Date.ValueOf() ); 1376838719230

Number: Returns a numeric value
VarNum=15.26540;
Document.Writeln(Num.ValueOf() ); 15.2654

Boolean: Returns a Boolean value of TRUE or False
Varbool= True;
Document.Writeln(bool.ValueOf() ===bool); True
New A Boolean object
VarNewbool= New Boolean(True);
ValueOf () returns True, and the values of the two are equal
Document.Writeln(Newbool.ValueOf() ==Newbool); True
But not congruent, the two types are not equal, the former is a Boolean type, the latter is the object type
Document.Writeln(Newbool.ValueOf() ===Newbool); False

Function: Returns the functions themselves
functionFoo(){ 
}
Document.Writeln(Foo.ValueOf() ===Foo); True
VarFoo2=New Function("X", "Y", "Return x + y;");
Document.Writeln(Foo2.ValueOf() ===Foo2); True

Object: Returns the objects themselves
VarObj= {Name: "Zhang San",Age: 18};
Document.Writeln(Obj.ValueOf() ===Obj); True

String: Returns a String value
VarStr= "Http://www.365mini.com";
Document.Writeln(Str.ValueOf() ===Str //true 
 //new one string object  
 var str2 = new string ( "http.// Www.365mini.com ");  
 //the values are equal, but not identical, because the type is different, the former is of type string, and the latter is the object type  
 Document. Writeln ( Str2. Valueof ()  === str2  Span class= "PLN" > //false           

Run code

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The JavaScript valueOf () function is detailed