Inheritance implementation code of Javascript class_javascript skills

To learn classes in JavaScript, methods
inherited from basic classes can also be implemented like this:
Java code

Copy code The code is as follows:

function newClass(){
this.firstName="frank";
this.toUc=String.toUpperCase;
this.toString=function() {
return this.toUc(this.firstName);
}
}
var nc=new newClass();
alert(nc);//No response in IE. .
function newClass(){
this.firstName="frank";
this.toUc=String.toUpperCase;
this.toString=function(){
return this.toUc(this .firstName);
}
}
var nc=new newClass();
alert(nc);//No response in IE. .

A simple client-side validation
Java code

<title>javascript</title> <form action="#" name="test" method="post"> <input type="text" name="firstName"> First name: <input type="text" name="lastName"> Last name:<input type="button" value="submit" onclick="doSubmit(this.form);"> </form>
[Ctrl A Select all Note: If you need to introduce external Js, you need to refresh to execute

]

<title> </title>javascript <form action="#" name="test" method="post"> <input type="text" name="firstName"> <input type="text" name="lastName"> First name: <input type="button" value="submit" onclick="doSubmit(this.form);"> Last name:</form>
[Ctrl A Select all Note:

If you need to introduce external Js, you need to refresh to execute
]

Usually write like this

Java codeCopy code

The code is as follows:

First name:


Last name: