发布于 2017-03-12 12:18:45 | 137 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。
本文实例讲述了JS实现文字掉落效果的方法。分享给大家供大家参考。具体实现方法如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="ru">
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="jquery-1.6.2.min.js" type="text/javascript"></script>
<style type="text/css">
.canvas{
width:500px;
height:500px;
position:relative;
}
</style>
</head>
<body>
<div>
<input type="button" onclick="javascript:falling.init();" value="GO" />
</div>
<div class="canvas" id="canvas"></div>
<script type="text/javascript">
/*
*坠落效果
*/
function Falling(){
this.dict=["abcd","2222","sign","next","container","content","last","break","less","than","that","absolute","relative","my","index","html","java","c#","web","javascript","php","include","shit","bull","big","smart","call","apply","callee","caller","function"];
this.canvas=$("#canvas");
this.step=15;
this.freq=10;
this.height=500;
this.width=500;
this.si=null;
}
Falling.prototype={
fallingAction:function(dom){
var self=this;
var freqs=[10,15,20];//每次下落的距离
var disS=[];//记录所有dom的当前距离
var disPerFreqS=[];//每个dom的
var targetDis=500;
var domCssTopS=[];//所有dom的top属性
var successDom=[];//记录哪些dom已经结束运动
var successCount=0;//有多少个dom已经结束
var total=dom.length;
var freqMarkLength=freqs.length;
for(var i=0,j=dom.length;i<j;i++){
domCssTopS[i]=dom[i].position().top;
disS[i]=0;
disPerFreqS[i]=freqs[parseInt(Math.random()*freqMarkLength)];
}
self.si=setInterval(function(){
if(successCount>=total){
clearInterval(self.si);
}
for(var i=0,j=dom.length;i<j;i++){
if(typeof(successDom[i])!="undefined" && successDom[i]=="ok"){
continue;
}
disS[i] += disPerFreqS[i];
if(disS[i] >= targetDis){
dom[i].css("top", targetDis+domCssTopS[i]);
successDom[i]="ok";
successCount++;;
}else{
dom[i].css("top", disS[i]+domCssTopS[i]);
}
}
},self.freq);
},
init:function(){
var self=this;
self.canvas.html('');
var dom=[];
var l=0;
var t=0;
var tempDom=$("<div style='position;absolute;left:-100000;visibility:hidden'></div>").appendTo($("body"));
for(var i=0,j=self.dict.length;i<j;i++){
dom[i]=$("<span style='position:absolute'>"+self.dict[i]+"</span>").appendTo(tempDom);
var domWidth=dom[i].width();
var domHeight=dom[i].height();
if(t<self.height){
if(l<self.width){
if(domWidth+l<=self.width){
dom[i].css({"top":t,"left":l});
self.canvas.append(dom[i]);
l += dom[i].width();
}else{
if(domHeight+t<=self.height){
t=t+domHeight;
dom[i].css({"top":t,"left":0});
self.canvas.append(dom[i]);
l = dom[i].width();
}else{
break;//到极限了
}
}
}else{
if(domHeight+t<=self.height){
t=t+domHeight;
l=0;
dom[i].css({"top":t,"left":l});
self.canvas.append(dom[i]);
}else{
break;//到极限了
}
}
}//else极限
}
/*
for(var i=0,l=self.dict.length;i<l;i++){
self.fallingAction(dom[i]);
}
*/
self.fallingAction(dom);
}
}
var falling=new Falling();
falling.init();
</script>
</body>
</html>希望本文所述对大家的javascript程序设计有所帮助。