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list_by_javascript.html 2.3 KB
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更新了文档和代码  
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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>动态列表</title>
	<style>
		* {
			margin: 0;
			padding: 0;
		}
		body {
			background-color: #000;
			color: #fff;
		}
		#app {
			width: 40%;
			margin: 20px auto;
		}
		#fruits>li {
			width: 90%;
			height: 50px;
			background-color: #6ca;
			margin: 4px 0;
			text-align: center;
			font-size: 20px;
			list-style-type: none;
			line-height: 50px;
		}
		#fruits>li>a {
			float: right;
			color: #fff;
			text-decoration: none;
			margin-right: 10px;
		}
		#fruits+div {
			margin-top: 20px;
		}
		#fname {
			width: 70%;
			height: 40px;
			color: #fff;
			border-radius: 8px;
			border: none;
			outline: none;
			font-size: 20px;
			text-align: center;
			vertical-align: middle;
			background-color: #999;
		}
		#ok {
			width: 19%;
			height: 40px;
			color: #fff;
			background-color: #a45;
			border: none;
			outline: none;
			font-size: 16px;
			vertical-align: middle;
		}
	</style>
</head>
<body>
	<div id="app">
		<ul id="fruits">
			<li>苹果<a href="">×</a></li>
			<li>香蕉<a href="">×</a></li>
			<li>榴莲<a href="">×</a></li>
			<li>火龙果<a href="">×</a></li>
		</ul>
		<div>
			<input type="text" id="fname">
			<button id="ok">确定</button>
		</div>
	</div>
	<script>
	const ul = document.querySelector('#fruits')
	const fnameInput = document.querySelector('#fname')
	const okBtn = document.querySelector('#ok')
	const anchors = document.querySelectorAll('#fruits a')

	function removeItem(evt) {
		evt.preventDefault()
		let li = evt.target.parentNode
		li.parentNode.removeChild(li)
	}

	function addItem(evt) {
		let fname = fnameInput.value.trim()
		if (fname.length > 0) {
			let li = document.createElement('li')
			li.textContent = fname
			let a = document.createElement('a')
			a.setAttribute('href', '')
			a.textContent = '×'
			a.addEventListener('click', removeItem)
			li.appendChild(a)
			ul.insertBefore(li, ul.firstElementChild)
		}
		fnameInput.value = ''
		fnameInput.focus()
	}
	
	window.addEventListener('load', (evt) => {
		for (let i = 0; i < anchors.length; i += 1) {
			anchors[i].addEventListener('click', removeItem)
		}

		fnameInput.addEventListener('keydown', (evt) => {
			let code = evt.keyCode || evt.which
			if (code == 13) {
				addItem()
			} 
		})
		
		okBtn.addEventListener('click', addItem)
	})
	</script>
</body>
</html>