发布于 2017-01-20 00:15:18 | 136 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。

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图片漂浮效果想必大家都有见到过吧，一般都是通过js来实现的，下面为大家介绍的这个示例也是通过js实现的

 
<!--首页图片漂浮开始--> 
<script type="text/javascript" language="javascript"> 
function addEvent(obj, evtType, func, cap) { 
cap = cap || false; 
if (obj.addEventListener) { 
obj.addEventListener(evtType, func, cap); 
return true; 
} else if (obj.attachEvent) { 
if (cap) { 
obj.setCapture(); 
return true; 
} else { 
return obj.attachEvent("on" + evtType, func); 
} 
} else { 
return false; 
} 
} 
function getPageScroll() { 
var xScroll, yScroll; 
if (self.pageXOffset) { 
xScroll = self.pageXOffset; 
} else if (document.documentElement && document.documentElement.scrollLeft) { 
xScroll = document.documentElement.scrollLeft; 
} else if (document.body) { 
xScroll = document.body.scrollLeft; 
} 
if (self.pageYOffset) { 
yScroll = self.pageYOffset; 
} else if (document.documentElement && document.documentElement.scrollTop) { 
yScroll = document.documentElement.scrollTop; 
} else if (document.body) { 
yScroll = document.body.scrollTop; 
} 
arrayPageScroll = new Array(xScroll, yScroll); 
return arrayPageScroll; 
} 
function GetPageSize() { 
var xScroll, yScroll; 
if (window.innerHeight && window.scrollMaxY) { 
xScroll = document.body.scrollWidth; 
yScroll = window.innerHeight + window.scrollMaxY; 
} else if (document.body.scrollHeight > document.body.offsetHeight) { 
xScroll = document.body.scrollWidth; 
yScroll = document.body.scrollHeight; 
} else { 
xScroll = document.body.offsetWidth; 
yScroll = document.body.offsetHeight; 
} 
var windowWidth, windowHeight; 
if (self.innerHeight) { 
windowWidth = self.innerWidth; 
windowHeight = self.innerHeight; 
} else if (document.documentElement && document.documentElement.clientHeight) { 
windowWidth = document.documentElement.clientWidth; 
windowHeight = document.documentElement.clientHeight; 
} else if (document.body) { 
windowWidth = document.body.clientWidth; 
windowHeight = document.body.clientHeight; 
} 
if (yScroll < windowHeight) { 
pageHeight = windowHeight; 
} else { 
pageHeight = yScroll; 
} 
if (xScroll < windowWidth) { 
pageWidth = windowWidth; 
} else { 
pageWidth = xScroll; 
} 
arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight) 
return arrayPageSize; 
} 

var AdMoveConfig = new Object(); 
AdMoveConfig.IsInitialized = false; 
AdMoveConfig.ScrollX = 0; 
AdMoveConfig.ScrollY = 0; 
AdMoveConfig.MoveWidth = 0; 
AdMoveConfig.MoveHeight = 0; 
AdMoveConfig.Resize = function () { 
var winsize = GetPageSize(); 
AdMoveConfig.MoveWidth = winsize[2]; 
AdMoveConfig.MoveHeight = winsize[3]; 
AdMoveConfig.Scroll(); 
} 
AdMoveConfig.Scroll = function () { 
var winscroll = getPageScroll(); 
AdMoveConfig.ScrollX = winscroll[0]; 
AdMoveConfig.ScrollY = winscroll[1]; 
} 
addEvent(window, "resize", AdMoveConfig.Resize); 
addEvent(window, "scroll", AdMoveConfig.Scroll); 
function AdMove(id) { 
if (!AdMoveConfig.IsInitialized) { 
AdMoveConfig.Resize(); 
AdMoveConfig.IsInitialized = true; 
} 
var obj = document.getElementById(id); 
obj.style.position = "absolute"; 
var W = AdMoveConfig.MoveWidth - obj.offsetWidth; 
var H = AdMoveConfig.MoveHeight - obj.offsetHeight; 
var x = W * Math.random(), y = H * Math.random(); 
var rad = (Math.random() + 1) * Math.PI / 6; 
var kx = Math.sin(rad), ky = Math.cos(rad); 
var dirx = (Math.random() < 0.5 ? 1 : -1), diry = (Math.random() < 0.5 ? 1 : -1); 
var step = 1; 
var interval; 
this.SetLocation = function (vx, vy) { x = vx; y = vy; } 
this.SetDirection = function (vx, vy) { dirx = vx; diry = vy; } 
obj.CustomMethod = function () { 
obj.style.left = (x + AdMoveConfig.ScrollX) + "px"; 
obj.style.top = (y + AdMoveConfig.ScrollY) + "px"; 
rad = (Math.random() + 1) * Math.PI / 6; 
W = AdMoveConfig.MoveWidth - obj.offsetWidth; 
H = AdMoveConfig.MoveHeight - obj.offsetHeight; 
x = x + step * kx * dirx; 
if (x < 0) { dirx = 1; x = 0; kx = Math.sin(rad); ky = Math.cos(rad); } 
if (x > W) { dirx = -1; x = W; kx = Math.sin(rad); ky = Math.cos(rad); } 
y = y + step * ky * diry; 
if (y < 0) { diry = 1; y = 0; kx = Math.sin(rad); ky = Math.cos(rad); } 
if (y > H) { diry = -1; y = H; kx = Math.sin(rad); ky = Math.cos(rad); } 
} 
this.Run = function () { 
var delay = 10; 
interval = setInterval(obj.CustomMethod, delay); 
obj.onmouseover = function () { clearInterval(interval); } 
obj.onmouseout = function () { interval = setInterval(obj.CustomMethod, delay); } 
} 
} 
</script> 
<!--漂浮开始--> 
<DIV id=ad2 style="Z-INDEX: 5;position:relative"> 

<a href='PoliceHTk.aspx' target='_blank'><IMG src="images/fudong/fudong.jpg" width="230" height="150" border="0" > </a><br> <a href="#" onclick="document.getElementById('ad2').style.display='none'">                   <img border=0 src=images/fudong/close1.gif /></a> 
<!--漂浮结束--> 
</DIV> 
<script type="text/javascript" language="javascript"> 

var ad2 = new AdMove("ad2"); 
ad2.Run(); 
//多组漂浮 

</script> 
<!-- 首页图片漂浮结束 -->