MyJavaScriptCode/comment.html at master · YuHe0108/MyJavaScriptCode · GitHub

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<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<title>发表评论</title>
	<link rel="stylesheet" href="">
	<style>
		* {
			margin: 0;
			padding: 0;
			list-style: none;
		}
		.c_father {
			width: 600px;
			border: 1px solid #ccc;
			margin: 100px auto;
			text-align: center;
			padding: 10px;
		}
		.c_father .c_textarea {
			width: 90%;
			display: block;
			margin: 0 auto;
			margin-bottom: 20px;
			margin-top: 20px;
			font-size: 20px;
		}
		.c_father ul li {
			margin-top: 10px;
			border-bottom: 1px dashed #ccc;
			line-height: 38px;
			text-align: left;
			padding: 4px;
		}
		a {
			text-decoration: none;
			float: right;
			color: black;
		}
		button {
			margin-left: -471px;
			width: 74px;
			height: 38px;
			font-size: 20px;
			color: white;
			background: green;
			border-radius: 50px; //设置为圆角
		}
		label {
			font-size: 25px;
		}
	</style>
	<script>
		window.onload = function () {
			var oBut = document.getElementsByTagName("button")[0];
			var oTextArea = document.getElementsByTagName("textarea")[0];
			var oUl = document.getElementsByTagName("ul")[0];
			oBut.onclick = function () {
				var Str = oTextArea.value;  //获取在文本框中输入的内容
				var oNewLi = document.createElement("li");
				var oA = document.createElement("a");
				var aLis = oUl.getElementsByTagName("li"); //如果aLis的长度为1，则表明这是第一个添加的
				oNewLi.innerHTML = Str;
				if (Str === '') {
					alert("您还没有输入内容哟!");
				} else {
					oA.innerHTML = "删除";
					oA.setAttribute("href", "#");
					oNewLi.appendChild(oA);

					console.log(aLis.length);
					if (aLis.length === 0) {
						oUl.appendChild(oNewLi);
					} else {
						oUl.insertBefore(oNewLi, aLis[0]);
					}

					var aAtags = document.getElementsByTagName("a");

					for (var i = 0; i < aAtags.length; i++) {
						aAtags[i].onclick = function () {
							var oParentNode = this.parentNode;
							oParentNode.remove();
						};
					}
				}
			};
		};
	</script>
</head>
<body>
	<div id="i_father" class="c_father">
		<label>请在此处发表言论</label>
		<textarea class="c_textarea" id="i_textarea" cols="30" rows="10"></textarea>
		<button>发表</button>
		<ul>
			<!-- <li>中国你好<a href="#" id="i_a">删除</a></li> -->
		</ul>
	</div>
</body>
</html>