在网页中显示一个工作中的"数字时钟"
html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>动态时钟</title>
<style>
.all{
width: 600px;
height: 300px;
margin: 100px auto;
text-align: center;
font-size: 50px;
}
#clock{
margin-top: 50px;
margin-left: 100px;
width: 400px;
height: 100px;
font-size: 100px;
text-align: center;
font: bold;
color: black;
}
.text{
font-size: 30px;
font-weight: bold;
}
</style>
<script type="text/javascript">
function showTime(clock){
var now = new Date();
var hour = now.getHours();
var minu = now.getMinutes();
var second = now.getSeconds();
var time =hour+":"+minu+":"+second;
clock.innerHTML=time;
}
window.onload = function(){
var clock = document.getElementById("clock");
window.setInterval("showTime(clock)",1000);
}
</script>
</head>
<body>
<div class="all">
<p>数字时钟</p>
<div id ="clock"></div>
</div>
</body>
</html>
结果
2.制作一个"禁止使用鼠标右键"操作网页,当浏览者在网页上右击时,自动弹出一个警告对话框,禁止用户使用右键快捷菜单。
html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>禁止下载</title>
<style>
img{
width: 600px;
height: 600px;
margin-left: 200px;
}
</style>
</head>
<body>
<p id="img">
<img src="img/p3.jpg" />
</p>
<script type="text/javascript">
var demo=document.getElementById("img");
demo.oncontextmenu=a;
function a(){
alert("禁止下载图片!");
}
document.addEventListener('contextmenu',function(b){
b.preventDefault(); //阻止上下文菜单
});
</script>
</body>
</html>
结果