setTimeout用法

var gTimes = 0;
var bNum = "";
gunNum($(".page"));
function gunNum($obj){
    bNum +=  Math.floor(Math.random()*9);
    $obj.text(bNum);
    gTimes++;
    if(gTimes < 5)
    {
        //setTimeout(gunNum,200,$obj);不兼容ie
        setTimeout(function(){gunNum($obj)}, 200);
    }
    else
    {
        $obj.text(tnbNum);
    }
}