日期:2014-05-16  浏览次数:20498 次

求给一个有关JS对象应用的案例,看了很多对象方面知识,求实践
一直半懂,书上的例子子都是动物啊,人啊什么的,实践起来肯定不是这样的,有适合初学者练习的案例吗?谢谢啊

------解决方案--------------------
正好有个js对象,操作移动层的,很实用,提供参考

HTML code

<!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>JS对象</title>
<style type="text/css">
*{ font-family:verdana;}
body{ font-size:12px;}
pre{font-family:verdana,arial; font-size:11px; color:#0000FF;}
.red{color:#FF0000;}
</style>
<script language="javascript" type="text/javascript">
function $(refID){ return typeof(refID)=='string' ? document.getElementById(refID) : refID; }

var objMove={
    description:'move div auto free in screen',
    author:'shenzhenNBA',
    playerID:'',
    x:0,
    y:0,
    oid:'',
    o:'',
    diffX:2,
    diffY:2,
    speed:30,
    borderStyle:'1px solid #FF0000',
    width:160,
    height:90,
    trim:function(str){return str.replace(/^\s*|\s*$/g,''); },
    init:function(divID){
        this.oid=this.trim(divID);  
        if(this.oid=='') return;
        this.o=$(divID);        
        if(!this.o) return;   
        this.o.style.border=this.borderStyle;
        this.o.style.position='absolute';        
        this.o.style.backgroundColor='#FFFFFF';
        this.o.style.padding='5px';
        this.o.style.width=this.width+'px';
        this.o.style.height=this.height+'px';
        this.o.style.zIndex=8888;
        this.o.style.display='block';        
        try{
        this.x=parseInt(this.o.style.left); 
        this.y=parseInt(this.o.style.top);
        if(isNaN(this.x)) this.x=0;
        if(isNaN(this.y)) this.y=0;
        }catch(e){
        this.x=0; this.y=0;
        }
        var _this=this;  
        this.o.onmouseover=function(){clearInterval(_this.playerID);}
        this.o.onmouseout=function(){
            _this.move();            
        }
    },
    move:function(){
        if(this.oid=='') return;       
        var motherObj=this;            
        this.playerID=setInterval(function(){ 

            motherObj.x+=motherObj.diffX;  
            motherObj.y+=motherObj.diffY;
            
            if(motherObj.x>=screen.width-motherObj.width) motherObj.diffX = -Math.abs(motherObj.diffX);    
            if(motherObj.x<0) motherObj.diffX = Math.abs(motherObj.diffX);
            if(motherObj.y>=screen.height-motherObj.height) motherObj.diffY = -Math.abs(motherObj.diffY);
            if(motherObj.y<0) motherObj.diffY = Math.abs(motherObj.diffY);
            motherObj.o.style.left = motherObj.x+'px';
            motherObj.o.style.top = motherObj.y+'px';
            
            $('moveTip').innerHTML='[X:'+motherObj.x+',Y:'+motherObj.y+']';
        },this.speed);                
    }
};
</script>
</head>
<body>
<h2>JS对象,层的移动</h2>
<pre>&nbsp;</pre>
<div id="moveTip"> move tip content...</div>
<div id="moveDiv" style="left:30; top:100;"> move div content,<br>
</div>
<script language="javascript" type="text/javascript">
window.onload=function(){
objMove.init('moveDiv');
objMove.move();
}
</script>
<br>
</body>
</html>