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JavaScript Learning Note three: JavaScript objects

Source: Internet
Author: User
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First, preface

  • Basic concepts of Objects : JavaScript provides multiple built-in objects, such as String, Data, array, and so on. Object refers to a special data type with properties and methods
  • To create an object: There are two main ways to create a JavaScript object: First, define an instance of the created object, and second, use a function to define the object, and then create a new object
  • <!DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd "><HTML><Head></Head><Body><Script>    //Create a direct instancepersion= NewObject (); Persion.firstname= "Bill"; Persion.lastname= "Gates"; Persion.age=  About; Persion.eyecolor= "Blue"; document.write (Persion.firstname+ " is" +Persion.age+ "years old.<br/>"); //alternative syntax (using object literals)persion={firstname:"John", LastName:"Doe", Age: -, Eyecolor:"Blue"}; document.write (Persion.firstname+ " is" +Persion.age+ "years old.<br/>"); //constructing objects using constructors    functionPersionv (firstname,lastname,age,eyecolor) { This. FirstName=FirstName;  This. LastName=LastName;  This. Age=Age ;  This. Eyecolor=Eyecolor; //add a method to a JavaScript object         This. ChangeName=ChangeName; functionChangeName (name) { This. LastName=name; }} myfather=  NewPersionv ("Bill","GateV1", the,"Red"); document.write (Myfather.firstname+ " is" +Myfather.age+ "years old.<br/>"); Myfather.changename ("hehehe"); document.write (Myfather.firstname+ " " +Myfather.lastname+ " is" +Myfather.age+ "years old.<br/>");</Script></Body></HTML>

  • access the properties of an object, which refers to an object-related value, and the syntax for accessing an object's properties is as follows:
    Objectname.propertyname

    Specific examples:

  • <!DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd "><HTML><Head></Head><Body><Script>    varmessage= "Hello world!"; varx=message.length; document.write (x)</Script></Body></HTML>

  • methods for accessing objects : Methods are actions that can be performed on an object, with the following syntax:
  • Objectname.methodname ()

    Specific examples:

  • <!DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd "><HTML><Head></Head><Body><Script>    varmessage= "Hello world!"; varx=message.touppercase (); document.write (x)</Script></Body></HTML>

JavaScript Learning Note three: JavaScript objects

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