js--返回顶部

$(document).ready(function(){
$("#goToTop").bind("click",EventHandle.goTop);	
//$("#goToTop").click(EventHandle.goTop);
});

var EventHandle = {
goTop:function(){
acceleration = 0.1;
time = 16;

var x1=0,
y1=0,
x2=0,
y2=0,
x3=0,
y3=0;
if(document.body){
x1 = document.body.scrollTop || 0;
y1 = document.body.scrollLeft || 0;
console.log(x1+","+y1); 
}
if(document.documentElement){
x2 = document.documentElement.scrollLeft || 0;
y2 = document.documentElement.scrollTop || 0 ;
console.log(x2+","+y2);	
}

x3 = window.scrollX || 0 ;
y3 = window.scrollY || 0 ;


//x = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop;
//y = document.documentElement.scrollLeft? document.documentElement.scrollLeft: document.body.scrollLeft;

var x = Math.max(x1,Math.max(x2,x3));
var y = Math.max(y1,Math.max(y2,y3));

EventHandle.ConsoleLog("x,y="+x+","+y);	
EventHandle.ConsoleLog("acceleration="+parseFloat(acceleration.toString()));	
var speed = 1 +parseFloat(acceleration.toString());
x5 = Math.floor(x / speed),y5 = Math.floor( y / speed);
console.log("speed="+speed+",x5="+x5+",y5="+y5);
window.scrollTo(x5,y5);

if(x>0 || y>0){
console.log("here");
var invokeFunction = EventHandle.goTop(acceleration,time);
window.setTimeout(invokeFunction,time);	
}	

},
ConsoleLog:function(str){
console.log(str);
}	

};