JavaScript Object-oriented shared member properties and methods and prototype keyword usage _javascript techniques

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Shared member properties and methods, using prototype keywords

Copy Code code as follows:

<script language= "javascript" type= "Text/javascript" >
function Dog () {}
Dog.prototype.shout=function () {
Alert ("Hello, puppy");
}
Dog.prototype.name= "Yellow Puppy";
var dog1 = new Dog ();
var dog2 = new Dog ();
Dog1.shout ();
Dog2.shout ();
Dog1.name= "Small white";
Window.alert (Dog1.name+dog2.name);
</script>

Attention to knowledge points:

(1) Use this. Property name or method name, or you can share them with instantiated objects, but they are stored in a different space (stack area). In this case, each object has exclusive code, and if there are many objects, it will make the efficiency lower;
(2) using prototype, it is stored in the same stack area, that is, multiple objects sharing code. When you change one of these objects, it does not affect other objects.

I hope this article will help you with your JavaScript programming.