onkeyup javascript

1var person = {	
2  	"first_name": "Bob",
3	"last_name": "Dylan"
4};
5person.hasOwnProperty('first_name'); //returns true
6person.hasOwnProperty('age'); //returns false

1<input type="text" onkeyup="myFunction()">

1<input type="text" onkeyup="myFunction()"> //Or your Code

1A function is triggered when the user releases a key in an input field ( such as textarea, <input>, etc.)