wp/nwyj/.svn/pristine/cf/cfcfeafd42beb49af0c87bc40610eb2b1b642452.svn-base

/**
* 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) {
   //alert("===>start");
   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 (top.window.document.documentElement) {
       x1 = top.window.document.documentElement.scrollLeft || 0;
       y1 = top.window.document.documentElement.scrollTop || 0;
   }
   if (top.window.document.body) {
       x2 = top.window.document.body.scrollLeft || 0;
       y2 = top.window.document.body.scrollTop || 0;
   }
   var x3 = top.window.scrollX || 0;
   var y3 = top.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;
   top.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 + ")";
       top.window.setTimeout(run, stime);
   }
   /*console.log(x1);
   console.log(y1);
   console.log(x2);
   console.log(y2);
   console.log(x3);
   console.log(y3);*/
   //alert("===>end");
}