javascript里的类思想

<script language=javascript>
function File(filename,filesize)
{
this.filename=filename;
this.filesize=filesize;
}
function ArrayFile()
{
this.f = new Array();
this.count=0;
this.add=function(file)
{
  this.f.push(file);
  this.count+=1;
}
this.max=function(f1, f2, field)
{
  switch (field)
  {
   case "filename":
    return f1.filename>f2.filename? true:false;
   case "filesize":
    return f1.filesize>f2.filesize? true:false;
   default:
    return false;
  }
}
this.sort=function(field,order)
{
//order:desc asc
//field:filename filesize
  var len = this.f.length;
  if( len < 2 ) return;
  var tmp;
  for(var i=0; i<len-1; i++)
  {
   for(var j=i+1; j<len; j++)
   {
    if( order == "desc")
    {
     if( !this.max(this.f[i], this.f[j], field) )
     {
      tmp = this.f[i];
      this.f[i] = this.f[j];
      this.f[j] = tmp;
     }
    }
    else if ( order == "asc")
    {
     if( this.max(this.f[i], this.f[j], field) )
     {
      tmp = this.f[i];
      this.f[i] = this.f[j];
      this.f[j] = tmp;
     }
    }
   }
  }
}
}
var t1 = new File("c.asp",32);
var t2 = new File("a.asp",132);
var t3 = new File("b.asp",12);
var ArrayFile = new ArrayFile();
ArrayFile.add(t1);
ArrayFile.add(t2);
ArrayFile.add(t3);
ArrayFile.sort("filesize","asc");
alert(ArrayFile.f[0].filename);
alert(ArrayFile.f[1].filename);
alert(ArrayFile.f[2].filename);
</script>

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