(function ( $ ) {        $.fn.ilscroll=function(options){        var settings = $.extend({      s:45    }, options );        $this=this;        $children=this.children();        $parent=this.parent();        $count=$children.size();        $margin=parseInt($children.css('margin-left'))+parseInt($children.css('margin-right'));$childrenwidth=$children.width()+$margin;$parentwidth=$parent.width();$width=($count*$childrenwidth);        if($width<$parentwidth){            return false;        }         $clone= $children.clone();         this.prepend($clone);        this.width($width*2);    $inter=    setInterval(function(){            $marginleft=$this.css('margin-left');              $marginleft=             parseInt($marginleft); $childh=   parseInt($this.children().width());  if(Math.abs($marginleft)>=$width){      $this.css('margin-left',"0px");    }else{            $this.css('margin-left',$marginleft-1+"px");        }        },settings.s);                    this.on('mouseover',function(){            clearInterval($inter);        });        this.on('mouseout',function(){        $inter=setInterval(function(){            $marginleft=$this.css('margin-left');              $marginleft=             parseInt($marginleft); $childh=   parseInt($this.children().width());  if(Math.abs($marginleft)==$width){      $this.css('margin-left',"0px");    }else{            $this.css('margin-left',$marginleft-1+"px");        }        },settings.s);        });            };        }( jQuery ));

 当子元素不比父元素宽时，不会发生滚动。

使用

$('.foo').ilscroll()

一个参数s用于控制速度.

修改用于应对margin-auto

(function ( $ ) {		$.fn.ilscroll=function(options){		var settings = $.extend({      s:45    }, options );		$this=this;		$children=this.children();		$parent=this.parent();		$count=$children.size();		$marginleft=$children.css('margin-left')=='auto'?0:parseInt($children.css('margin-left'));		if($children.css){					}		$children.css('margin-left','0px');		$children.css('margin-right','0px');		$margin=parseInt($children.css('margin-left'))+parseInt($children.css('margin-right'));$childrenwidth=parseInt($children.width())+$margin;$parentwidth=parseInt($parent.width());$width=($count*$childrenwidth);		if($width<$parentwidth){			return ;		}else{				 $clone= $children.clone();		 this.prepend($clone);		this.width($width*2);		}	$inter=	setInterval(function(){			$marginleft=$this.css('margin-left');		if($marginleft==='auto'){			$marginleft=0;		}else{			 $marginleft=parseInt($marginleft);		}		   $childh=   parseInt($this.children().width());  if(Math.abs($marginleft)>=$width){  	$this.css('margin-left',"0px");    }else{  				$this.css('margin-left',(($marginleft)-1)+"px");		}		},settings.s);					this.on('mouseover',function(){			clearInterval($inter);		});		this.on('mouseout',function(){		$inter=setInterval(function(){			$marginleft=$this.css('margin-left');			  $marginleft=			 parseInt($marginleft); $childh=   parseInt($this.children().width());  if(Math.abs($marginleft)==$width){  	$this.css('margin-left',"0px");    }else{			$this.css('margin-left',$marginleft-1+"px");		}		},settings.s);		});			};		}( jQuery ));