当前位置：网站首页>JS to add elements to the header, or tail of an array

JS to add elements to the header, or tail of an array

2022-06-25 14:27:00 【Enlightened gentleman】

js To array header 、 Or add elements at the end , Record here

1、js Add elements to the array header

Use unshift Method

Example

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
			var citys = [
                    {id:'2', name: ' Jun-yi lu '},
                    {id:'3', name: ' Wu Yong '}
            ]
			
			console.log('unshift front ')
			console.log(JSON.stringify(citys))
			
			citys.unshift({id:'1', name: ' Song Jiang '});
			console.log('unshift after ')
			console.log(JSON.stringify(citys))
		</script>
	</body>
</html>

Running effect

2、js Add an element to the end of the array

Use push Method

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
			var citys = [
					{id:'1', name: ' Song Jiang '},
                    {id:'2', name: ' Jun-yi lu '}
            ]
			
			console.log('push front ')
			console.log(JSON.stringify(citys))
			
			citys.push({id:'3', name: ' Wu Yong '});
			console.log('push after ')
			console.log(JSON.stringify(citys))
		</script>
	</body>
</html>

Running effect