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How to add properties and methods to an existing object in JavaScript?
Following is the code for adding properties and methods to an existing object in JavaScript −
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
.result {
font-size: 20px;
font-weight: 500;
color: blueviolet;
}
</style>
</head>
<body>
<h1>Add properties and methods to an existing object in JavaScript</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to add property and methods to student object and display
them</h3>
<script>
let resEle = document.querySelector(".result");
let BtnEle = document.querySelector(".Btn");
let student = {
};
BtnEle.addEventListener("click", () => {
student.name = 'Rohan Sharma';
student.age = 16;
student.place = 'Delhi';
student.displayInfo = function(){
return 'Name = '+this.name+' : Age = '+this.age+' : Place = '+this.place;
}
resEle.innerHTML += student.displayInfo();
});
</script>
</body>
</html>Output
On clicking the ‘CLICK HERE’ button −
Updated on: 22-Jul-2020
159 Views
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