sample.js

$(document).ready(function()
{
	$('#sumbit').addClass('button_summit'); // add class to given button using addClass() function
	$('#sumbit').removeClass('button_summit'); // remove class to given button using removeClass() function
	$('#sumbit').css('color', 'red'); // add text color to given button using css() function
	$('#sumbit').prop('disabled', true); // disabled button using prop() function
	$('#sumbit').html('send'); //Change Text Inside an Element Using jQuery
	$('#sumbit1').remove(); //Remove an Element Using jQuery
	$('.third1').clone().appendTo('.left'); //Clone an Element Using jQuery
	$('.first').parent().css('color', 'red'); //Target the Parent of an Element Using jQuery
	$('.right').children().css('color', 'green'); //Target the Children of an Element Using jQuery

	var myName; // declare variable in javascript
	var name = "daliya"; // assign value to the variable
	var add = a + b; //add 2 values and store in one variable
	var sub = a - b; //subtract 2 values and store in one variable
	var mul = a * b; //multiply 2 values and store in one variable
	var div = a / b; //divide 2 values and store in one variable
	var number ;
	number--;  // decrement value
	number++;  // increment value

	function convertToF(celsius) {    // Convert Celsius to Fahrenheit
  	var fahrenheit;
  	fahrenheit = celsius * 9/5 + 32;
  	return fahrenheit;
	}
		convertToF(30);

	var myFirstName  = "daliya";  // Declare String Variables

	var myStr = "I am a \"double quoted\" string inside \"double quotes\".";   //Escaping Literal Quotes in Strings

	var myStr = "This is the start. " + "This is the end."; // Concatenating Strings with Plus Operator

	var myStr= "This is the first sentence. "; // Concatenating Strings with the Plus Equals Operator
	myStr +="This is the second sentence.";

	var myName = "daliya";      //Constructing Strings with Variables
	var myStr = "My name is  " + myName + " and I am swell!";

	var firstLetterOfLastName = "";  //Use Bracket Notation to Find the First Character in a String
	var lastName = "Lovelace";
	firstLetterOfLastName = lastName[0]; 

	
	window.onload = function(){
		setTimeout(function(){
			var parentId = document.getElementById("gif-image");
			var childId = document.getElementById("gif-id");
			parentId.removeChild(childId);
		}, 3000);
	};
});