发布于 2016-10-13 12:15:49 | 111 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Javascript教程，程序狗速度看过来！
JavaScript客户端脚本语言
Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。
<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" href="style.css" />
<script type="text/javascript" src="drag.js"></script>
<script type="text/javascript" src="demo.js"></script>
</head>
<body>
<div id="login">
<h2>网站登录</h2>
<div class="user">
用户名：<input type="text" name="user" class="txt" />
</div>
<div class="pass">
密 码：<input type="password" name="pass" class="txt" />
</div>
<div class="submit">
<input type="submit" value="登录" class="button" />
</div>
</div>
</body>
</html>
body, h2 {
margin:0;
padding:0;
}
#login {
width:350px;
height:250px;
border:1px solid #ccc;
position:absolute;
left:512px;
top:300px;
}
#login h2 {
font-size:14px;
text-align:center;
height:30px;
line-height:30px;
background:#f60;
color:white;
cursor:move;
margin-bottom:30px;
letter-spacing:1px;
}
#login .user, #login .pass {
text-align:center;
font-size:12px;
height:60px;
line-height:40px;
}
#login .txt {
width:200px;
border:1px solid #ccc;
background:#fff;
height:30px;
line-height:30px;
}
#login .submit {
text-align:right;
}
#login .button {
width:100px;
height:30px;
background:#06f;
border:none;
cursor:pointer;
margin:10px 30px;
color:white;
letter-spacing:1px;
font-weight:bold;
}
function drag(obj) {
if (typeof obj === 'string') {
var obj = document.getElementById(obj);
} else {
var obj = obj;
}
function fixEvent(event) {
event.target = event.srcElement;
event.preventDefault = fixEvent.preventDefault;
return event;
}
fixEvent.preventDefault = function () {
this.returnValue = false;
};
obj.onmousedown = mousedown;
function mousedown(e) {
var e = e || fixEvent(window.event);
var disX = e.clientX - obj.offsetLeft;
var disY = e.clientY - obj.offsetTop;
if (e.target.tagName === 'H2') {
document.onmousemove = move;
document.onmouseup = up;
} else {
document.onmousemove = null;
document.onmouseup = null;
}
function move(e) {
var e = e || fixEvent(window.event);
var left = e.clientX - disX;
var top = e.clientY - disY;
if (obj.setCapture) {
obj.setCapture();
}
if (left < 0) {
left = 0;
} else if (left > document.documentElement.clientWidth - obj.offsetWidth) {
left = document.documentElement.clientWidth - obj.offsetWidth;
}
if (top < 0) {
top = 0;
} else if (top > document.documentElement.clientHeight - obj.offsetHeight) {
top = document.documentElement.clientHeight - obj.offsetHeight;
}
obj.style.left = left + 'px';
obj.style.top = top + 'px';
return false;
};
function up() {
if (obj.releaseCapture) {
obj.releaseCapture();
}
document.onmousemove = null;
document.onmouseup = null;
}
};
}
window.onload = function () {
var login = document.getElementById('login');
drag(login);
};