Objects constructor

時間 2019-11-12

標籤 objects constructor 简体版

原文原文鏈接

Objects constructor:html

to have an "object type" that can be used to create many objects of one type.

The standard way to create an "object type" is to use an object constructor function.this

<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
function person(first, last, age, eye) {
    this.firstName = first;
    this.lastName = last;
    this.age = age;
    this.eyeColor = eye;
}

var myFather = new person("John", "Doe", 50, "blue");
var myMother = new person("Sally", "Rally", 48, "green");

document.getElementById("demo").innerHTML =
"My father is " + myFather.age + ". My mother is " + myMother.age; 
</script>

</body>
</html>

運行圖以下：spa

The this Keyword

In JavaScript, the thing called this, is the object that "owns" the JavaScript code.code

The value of this, when used in a function, is the object that "owns" the function.htm

The value of this, when used in an object, is the object itself.blog

The this keyword in an object constructor does not have a value. It is only a substitute for the new object.ip

The value of this will become the new object when the constructor is used to create an object.get

AND JavaScript Objects are Mutable

<!DOCTYPE html>
<html>
<body>

<p>JavaScript objects are mutable.</p>
<p>Any changes to a copy of an object will also change the original.</p>

<p id="demo"></p>

<script>
var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}

var x = person;
x.age = 20;

document.getElementById("demo").innerHTML =
person.firstName + " is " + x.age + " years old.";
</script>

</body>
</html>

運行圖以下：it

1. prototype & constructor
2. JAVASCRIPT OBJECTS
3. objects
4. CPP05 Classes and Objects
5. prototype/constructor/__proto__之constructor。
6. References & the Copy-Constructor
7. Constructor or Setter?
8. JAVASCRIPT OBJECTS 詳解
9. constructor
10. Constructor
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