<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
class Cat{
// special method (constructors) constructor to create and initialize a class object is created
constructor () {
the this .name = "cat"
the this 18 is .age =
// Sound method every time an object is created to instantiate time, will take up more memory space, it is best not to write in the constructor
the this .sound = function () {
console.log ( "Oh, would call" )
}
}
// write out of constructor, would not each instantiation will be created once, saving space, can be found in the prototype
run () {
console.log ( "will run oh" )
}
}
var cat1=new Cat()
console.log(cat1)
</script>
</body>
</html>
Using inheritance
class BSCat extends Cat{ constructor(){ super() this.type="bscat" } layout () { console.log ( "cute" ) } } var bscat=new BSCat() console.log(bscat)