发布于 2017-01-05 10:04:58 | 64 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。


这篇文章介绍了几种JS的动态效果实例,有需要的朋友可以参考一下

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>浮动图片</title>
<script type="text/javascript">
var step = 1; // 移动的像素
var y = -1; // 垂直移动的方向,-1表示向上,1表示向下
var x = 1; // 水平移动的方向,-1表示向左,1表示向右
function myFloat()
{
var img = document.getElementById("myImg");
// 获取图片和当前浏览器窗口上边距,由于img.style.top获取的值带px单位
var top = img.style.top.replace("px", "");
// top = top - 100;
// img.style.top = top + "px";
// 获取图片和当前浏览器窗口左边距
var left = img.style.left.replace("px", "");
// left = left - 100;
// img.style.left = left + "px";
// 上下移动
if(top <= 0)
{
y = 1;
}
if(top >= document.body.clientHeight)
{
y = -1;
}
top = (top*1) + (step * y);
img.style.top = top + "px";
// 左右移动
if(left <= 0)
{
x = 1;
}
// alert(img.clientWidth);
if(left >= (document.body.clientWidth - img.clientWidth))
{
x = -1;
}
left = (left*1) + (step * x);
img.style.left = left + "px";
setTimeout("myFloat()", 20);
}
</script>
</head>
<body onload="myFloat();" style="height: 400px;">
<img id="myImg" src="http://files.phperz.com/file_images/article/201307/2013071009420928.png"
style="position: absolute; left: 500px; top: 400px; border: solid 1px black;" />
</body>
</html>

另一种的实现方式

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>浮动广告实例</title>
<script type="text/javascript">
    var pos = 10;
    function toueme() {
        document.getElementById("toubiao").style.display = "none";
    }
    function initArray() {
        this.length = initArray.arguments.length;
        for (var i = 0; i < this.length; i++) {
            this[i] = initArray.arguments[i];
        }
    }
    var col = new initArray("4b", "5b", "8b", "8b");
    col[0] = "yellow";
    col[1] = "coral";
    col[2] = "orange";
    col[3] = "red";
    col[4] = "greenyellow";
    col[5] = "lime";
    col[6] = "turquoise";
    col[7] = "coral";
    col[8] = "blueviolet";
    col[9] = "violet";
    function chgCol() {
        pos++;
        if (pos < 0 || pos > 9) {
            pos = 0;
        }
        document.bgColor = col[pos];
        setTimeout("chgCol()", 500);
    }
</script>
</head>
<body bgColor="#ffffff" onload="chgCol();pingpong();">
<DIV id=img1
     style="Z-INDEX: 100;
     LEFT: 12px;
     WIDTH: 159px;
     POSITION: absolute;
     TOP: 143px;
     HEIGHT: 161px;
 visibility: visible;">
 <div id=toubiao>
     <a style="CURSOR: hand" onClick=toueme()>
    <img
      src="close.gif"
      width=84 height=11 hspace="6" border=0></a>
 </div>
 <a href="#" target="_blank">
 <img src="1.jpg" width="280" height="280" border="0">
 </a>
 </DIV>
<SCRIPT>
var xPos = 0;
var yPos = 0;
var step = 3;
var delay = 100;
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
img1.style.top = yPos;
function changePos()
{
    width = document.body.clientWidth; //获取浏览器的宽度
    height = document.body.clientHeight; //获取浏览器的高度
Hoffset = img1.offsetHeight;
Woffset = img1.offsetWidth;
img1.style.left = xPos + document.body.scrollLeft;
img1.style.top = yPos + document.body.scrollTop;
if (yon)
{yPos = yPos + step;}
else
{yPos = yPos - step;}
if (yPos < 0)
{yon = 1;yPos = 0;}
if (yPos >= (height - Hoffset))
{yon = 0;yPos = (height - Hoffset);}
if (xon)
{xPos = xPos + step;}
else
{xPos = xPos - step;}
if (xPos < 0)
{xon = 1;xPos = 0;}
if (xPos >= (width - Woffset))
{xon = 0;xPos = (width - Woffset);   }
}
function start()
{
img1.visibility = "visible";
interval = setInterval('changePos()', delay);
//interval = setTimeout("changePos()", delay);
}
function pause_resume()
{
if(pause)
{
clearInterval(interval);
pause = false;}
else
{
interval = setInterval('changePos()',delay);
pause = true;
}
}
start();
</SCRIPT>
</body>
</html>

JS实现气泡从水中急速上升效果

<html>
<head>
<title>JS实现气泡从水中急速上升效果</title>
<style type="text/css">
body {cursor:crosshair;margin:0; padding:0; position:absolute; overflow:hidden; background:#FFF; left:0; top:0; width:100%; height:100%;}
</style>
<script type="text/javascript">
var object = new Array();
nbfm   = 60;
var xm = 0;
var ym = 9999;
var nx = 0;
var ny = 0;
function movbulb(){
 with (this) {
  if(ec < 20){
   if(Math.abs(x0 - xm) < 100 && Math.abs(y0 - ym) < 100){
    xx = (xm - x0) / 8;
    yy = (ym - y0) / 8;
    ec++;
   }
  }
  xx *= 0.99;
  yy *= 0.99;
  x0 = Math.round(x0 + Math.cos(y0 / 15) * p) + xx;
  y0+= yy - v;
  if(y0 < -h * 2 || x0 < -w * 2 || x0 > nx + w * 2){
   y0 = ny + N + h * 2;
   x0 = nx/2-100 + Math.random() * 100;
   ec = 0;
  }
  obj.style.top  = y0 - h;
  obj.style.left = x0 - w;
 }
}
function CObj(N,img,w,h){
 this.obj = document.createElement("img");
 this.obj.src = img.src;
 this.obj.style.position = "absolute";
 this.obj.style.left = -1000;
 document.body.appendChild(this.obj);
 this.N  = N;
 this.x0 = 0;
 this.y0 = -1000;
 this.v  = 1 + Math.round((80 / h) * Math.random());
 this.p  = 1 + Math.round((w / 8) * Math.random());
 this.xx = 0;
 this.yy = 0;
 this.ec = 0;
 this.w  = w;
 this.h  = h;
 this.movbulb = movbulb;
}
function resize(){
 nx = document.body.offsetWidth;
 ny = document.body.offsetHeight;
}
onresize = resize;
document.onmousemove = function(e){
 if (window.event) e = window.event;
 xm = document.body.scrollLeft+(e.x || e.clientX);
 ym = document.body.scrollTop+(e.y || e.clientY);
}
function run(){
 for(i in object)object[i].movbulb();
 setTimeout(run, 16);
}
onload = function() {
 PIC = document.getElementById("bubbles").getElementsByTagName("img");
 resize();
 for(nbf=0;nbf<nbfm;nbf++){
  sf = PIC[nbf%PIC.length];
  object[nbf] = new CObj(nbf,sf,sf.width/2,sf.height/2);
 }
 run();
}
</script>
</head>
<body>
<div id="bubbles" style="visibility:hidden">
 <img src="smile.gif">
 <img src="biggrin.gif">
 <img src="eek.gif">
 <img src="rolleyes.gif">
</div>
</body>
</html>

浮动广告

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>浮动广告</title>
</head>
<body style="background-color:pink">
<div id="ad" style="position:absolute">
<a href=http://www.baidu.com target="_blank">
<img src="2.gif" border="0" width="120" heigth="80">
<input type="button" value="关闭窗口" onclick="closeWindow()"/><!-- 适用于IE浏览器 -->
</a>
</div>
<script type="text/javascript">
var x = 400,y = 300
var xin = true, yin = true
var step = 1
var delay = 25
var obj=document.getElementById("ad")
function floatAD()
{
var L=T=0
var R= document.body.clientWidth-obj.offsetWidth
var B = document.body.clientHeight-obj.offsetHeight
obj.style.left = x + document.body.scrollLeft
obj.style.top = y + document.body.scrollTop
x = x + step*(xin?1:-1)
if (x < L) { xin = true; x = L}
if (x > R){ xin = false; x = R}
y = y + step*(yin?1:-1)
if (y < T) { yin = true; y = T }
if (y > B) { yin = false; y = B }
}
var itl= setInterval("floatAD()", delay)
function closeWindow()
{
                      window.close();
                   }
</script>
<style type="text/css">
input{
   background-image:url(638.jpg);
   border:0px;
   margin:0px;
   padding:0px;
   height:23px;
   width:82px;
   font-size:14px;
}
</style>
</body>
</html>


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