By GokiSoft.com| 15:01 16/10/2020|
Học JS

[Share Code] Tìm hiểu mảng + object trong C - Lập trình C

#vidu.html


<!DOCTYPE html>
<html>
<head>
	<title>Javascript Tutorial</title>
	<meta charset="utf-8">
</head>
<body>
	<h1>Welcome to learn Array</h1>

	<script type="text/javascript">
		//Khai bao mang
		var arr1 = [];//mang rong
		//js: quan ly cac phan tu dong -> int, float, String, Object, ... => Nen quan ly cung datatype.
		//length: arr1.length - index: 0 -> length - 1
		//length: dong.
		console.log(arr1.length)
		//Them phan tu vao trong mang
		arr1.push(12)
		arr1.push(1)
		arr1.push(22)

		console.log(arr1[2])

		for (var i = 0; i < arr1.length; i++) {
			console.log(">>> " + arr1[i])
		}

		//Khai bao mang co san cac phan tu
		var arr2 = [1, 5, 2];
		for (var i = 0; i < arr2.length; i++) {
			console.log(arr2[i])
		}

		//Xoa phan tu trong mang
		arr2.splice(1, 1);
		arr2.push(9);
		arr2.splice(2, 0, 7, 65, 234, 324);
		for (var i = 0; i < arr2.length; i++) {
			console.log("???"+arr2[i])
		}

		//hien thi cac phan tu trong mang
		//for => nhu tren.
		arr2 = arr2.sort(function(a, b) {
			return a - b;
			//gia tri >= 0 => giu nguyen vi tri
			//gia tri < 0 => doi cho 2 vi tri.
		})
		for (var i = 0; i < arr2.length; i++) {
			console.log("---"+arr2[i])
		}

		//Tim hieu ve object
		//Sinh vien: ten => A, tuoi => 18, dia chi => Ha Noi
		var student = {
			fullname: 'A',
			age: 18,
			address: 'Ha Noi'
		}
		console.log(student)
		console.log(student.fullname)
		console.log(student.address)

		student.fullname = "ABCBABCBS"

		console.log(student.fullname)

		var studentList = [
			{
				fullname: 'A',
				age: 18,
				address: 'Ha Noi'
			}, {
				fullname: 'B',
				age: 28,
				address: 'Ha Noi'
			}
		]

		console.log(studentList)

		studentList.push({
				fullname: 'B',
				age: 28,
				address: 'Ha Noi'
			});
		student =  {
			fullname: 'B',
			age: 28,
			address: 'Ha Noi'
		};

		studentList.push(student)

		console.log(studentList)

		//Kieu du lieu khac nhau trong 1 mang => JS.
		var a = [
			1,
			2,
			{
				"fullname": "A"
			}
		]
		console.log(a)

		function showMessage(msg) {
			alert(msg)
		}

		showMessage("ABC")

		function tinhTong(x, y) {
			return x + y;
		}

		tong = tinhTong(5, 8)
		alert(tong)

		str = "123456789345"
		c = str.charAt(1)
		str = str.concat('ABC')
		index = str.lastIndexOf('345')
		alert(index)
	</script>
</body>
</html>


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