function scrollor()
{
// 捲動速度
var loop = false;
var scr;
var c=0;
var f=function (scroll,flips) {
	var rollor = document.getElementById(scroll);
rollor.scrollLeft = rollor.scrollLeft + flips;
rollor.scrollTop = rollor.scrollTop + flips;

};
var v=function (scroll,rate) {
	var rollor = document.getElementById(scroll);
	var currLeft = rollor.scrollLeft;
	var currTop = rollor.scrollTop;
	rollor.scrollLeft = rollor.scrollLeft + rate;
	rollor.scrollTop = rollor.scrollTop + rate;
	if (loop) {
		if (currLeft == rollor.scrollLeft) {
			// 如果滚动到最左侧了就初始化
			rollor.scrollLeft = (rollor.scrollLeft-c)/2;
		}
		if (currTop == rollor.scrollTop) {
			// 如果滚动到最底部了就初始化
			rollor.scrollTop = (rollor.scrollTop-c)/2;
		}
	}
};
this.roll=function (scroll,rate,speed) {
	scr = setInterval(function(){v(scroll,rate);},speed);
	//setInterval在oo中使用以匿名函數使用比較好用
};
this.flip=function (scroll,flips) {
	v(scroll,flips);
};
this.stop=function (scroll) {
	clearInterval(scr);
};
this.isloop=function (is,contaner,first,last)
{
	loop=is;
	c=contaner;
	// 注意这里，将第一列的内容复制到第二列，这样可以保证滚动看起来更连续
	document.getElementById(last).innerHTML = document.getElementById(first).innerHTML;
	};
}