JS实例全选反选页面随机换色倒计时跳转-3.28 - 作业

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实例

<!DOCTYPE html>
<html>
<head>
	<title>hello world!</title>
	<style type="text/css">
	div{width: 600px;margin: 100px auto;}
	table{width: 600px;border: 1px solid black;border-collapse: collapse;}
	td{border: 1px solid black;text-align: center;}
	</style>
</head>
<body>
	<button onclick="bg_Color()">点击变色</button>
	<div>
		<p>
			<button onclick="checkAll()">全选</button>
			<button onclick="checkOut()">反选</button>
		</p>
		<table>
			<thead>
				<tr>
					<th colspan="2">标题</th>
					<th>状态</th>
				</tr>
			</thead>
			<tbody>
				<tr>
					<td><input type="checkbox" name="list"></td>
					<td>标题一</td>
					<td>已读</td>
				</tr>
				<tr>
					<td><input type="checkbox" name="list"></td>
					<td>标题二</td>
					<td>已读</td>
				</tr>
				<tr>
					<td><input type="checkbox" name="list"></td>
					<td>标题三</td>
					<td>已读</td>
				</tr>
				<tr>
					<td><input type="checkbox" name="list"></td>
					<td>标题四</td>
					<td>已读</td>
				</tr>
				<tr>
					<td><input type="checkbox" name="list"></td>
					<td>标题五</td>
					<td>已读</td>
				</tr>
			</tbody>
		</table>
	</div>
	<script type="text/javascript">
		function bgColor(){
			var trList=document.getElementsByTagName("tbody")[0].getElementsByTagName("tr")
			for(var i=0;i<trList.length;i++){
				if(i%2){
					trList[i].style.background="pink";
				}else{
					trList[i].style.background="orange";
				}
			}
		}
		bgColor();
		function checkAll(){
			var objList=document.getElementsByName("list");
			for(var i=0;i<objList.length;i++){
				objList[i].checked=true;
			}
		}
		function checkOut(){
			var objList=document.getElementsByName("list");
			for(var i=0;i<objList.length;i++){
				if(objList[i].checked){
					objList[i].checked=false;
				}else{
					objList[i].checked=true;
				}
			}
		}
		function bg_Color(){
			var bg="#";
			var r=Math.floor(Math.random()*100).toString();
			var b=Math.floor(Math.random()*100).toString();
			var g=Math.floor(Math.random()*100).toString();
			bg+=r+b+g;
			document.getElementsByTagName("body")[0].style.background=bg;
		}
	</script>
</body>
</html>

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页面倒计时跳转

实例

<!DOCTYPE html>
<html>
<head>
	<title>hello world!</title>
	<style type="text/css">
	p{width: 300px;margin:100px auto;}
	span{width: 50px;height: 50px;font-size: 50px;color: red;line-height: 50px;text-align: center;display: inline-block;}
	</style>
</head>
<body>
	<p>还剩<span>5</span>秒跳转至<a href="https://www.baidu.com">百度</a></p>
	<script type="text/javascript">
		var Espan=document.getElementsByTagName('span')[0];
		var i=4;
		function fn(){
			if(i>0){
				Espan.innerHTML=i;
				i--;
			}else{
				window.location.href="https://www.baidu.com";
			}
		}
		setInterval("fn()",1000)
	</script>
</body>
</html>

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