JS实现文字掉落效果的方法
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：
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml"xml:lang="ru">
<head>
<title></title>
<metahttp-equiv="Content-Type"content="text/html;charset=utf-8"/>
<scriptsrc="jquery-1.6.2.min.js"type="text/javascript"></script>
<styletype="text/css">
.canvas{
width:500px;
height:500px;
position:relative;
}
</style>
</head>
<body>
<div>
<inputtype="button"onclick="javascript:falling.init();"value="GO"/>
</div>
<divclass="canvas"id="canvas"></div>
<scripttype="text/javascript">
/*
*坠落效果
*/
functionFalling(){
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=$("#canvas");
this.step=15;
this.freq=10;
this.height=500;
this.width=500;
this.si=null;
}
Falling.prototype={
fallingAction:function(dom){
varself=this;
varfreqs=[10,15,20];//每次下落的距离
vardisS=[];//记录所有dom的当前距离
vardisPerFreqS=[];//每个dom的
vartargetDis=500;
vardomCssTopS=[];//所有dom的top属性
varsuccessDom=[];//记录哪些dom已经结束运动
varsuccessCount=0;//有多少个dom已经结束
vartotal=dom.length;
varfreqMarkLength=freqs.length;
for(vari=0,j=dom.length;i<j;i++){
domCssTopS[i]=dom[i].position().top;
disS[i]=0;
disPerFreqS[i]=freqs[parseInt(Math.random()*freqMarkLength)];
}
self.si=setInterval(function(){
if(successCount>=total){
clearInterval(self.si);
}
for(vari=0,j=dom.length;i<j;i++){
if(typeof(successDom[i])!="undefined"&&successDom[i]=="ok"){
continue;
}
disS[i]+=disPerFreqS[i];
if(disS[i]>=targetDis){
dom[i].css("top",targetDis+domCssTopS[i]);
successDom[i]="ok";
successCount++;;
}else{
dom[i].css("top",disS[i]+domCssTopS[i]);
}
}
},self.freq);
},
init:function(){
varself=this;
self.canvas.html('');
vardom=[];
varl=0;
vart=0;
vartempDom=$("<divstyle='position;absolute;left:-100000;visibility:hidden'></div>").appendTo($("body"));
for(vari=0,j=self.dict.length;i<j;i++){
dom[i]=$("<spanstyle='position:absolute'>"+self.dict[i]+"</span>").appendTo(tempDom);
vardomWidth=dom[i].width();
vardomHeight=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(vari=0,l=self.dict.length;i<l;i++){
self.fallingAction(dom[i]);
}
*/
self.fallingAction(dom);
}
}
varfalling=newFalling();
falling.init();
</script>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。