/**
* javascript脚本实现回到页面顶部示例
* @param acceleration 速度
* @param stime 时间间隔 (毫秒)
**/
function gototop(acceleration,stime) {
   acceleration = acceleration || 0.1;
   stime = stime || 10;
   var x1 = 0;
   var y1 = 0;
   var x2 = 0;
   var y2 = 0;
   var x3 = 0;
   var y3 = 0; 
   if (document.documentelement) {
       x1 = document.documentelement.scrollleft || 0;
       y1 = document.documentelement.scrolltop || 0;
   }
   if (document.body) {
       x2 = document.body.scrollleft || 0;
       y2 = document.body.scrolltop || 0;
   }
   var x3 = window.scrollx || 0;
   var y3 = window.scrolly || 0;
 
   // 滚动条到页面顶部的水平距离
   var x = math.max(x1, math.max(x2, x3));
   // 滚动条到页面顶部的垂直距离
   var y = math.max(y1, math.max(y2, y3));
 
   // 滚动距离 = 目前距离 / 速度, 因为距离原来越小, 速度是大于 1 的数, 所以滚动距离会越来越小
   var speeding = 1 + acceleration;
   window.scrollto(math.floor(x / speeding), math.floor(y / speeding));
 
   // 如果距离不为零, 继续调用函数
   if(x > 0 || y > 0) {
       var run = "gototop(" + acceleration + ", " + stime + ")";
       window.settimeout(run, stime);
   }
}