页面加载完毕后，自动滚动

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页面加载完毕后，自动滚动到指定（如观看视频，图片的最佳）的位置。

关键代码如下：

    var h=$("#aa").scrollTop();
    $("body").animate({scrollTop:$("#aa").offset().top},3000);

});

红体字为要修改的参数，其它的不变即可。

注意在引入jquery库哦。

demo如下：

<!DOCTYPE html public "-//w3c//dtd html 4.0 transitional//EN">
<html>
 <head>
  <title> new document </title>
    <meta http-equiv="Content-Type" content="text/html;charset=GBK">
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-store">
    <meta http-equiv="expires" content="0">    
    <script language="javascript"src="jquery.js"></script>
  
 </head>
  <script language="JavaScript">
$(function($) {

    var h=$("#aa").scrollTop();    
    $("body").animate({scrollTop:$("#aa").offset().top},3000); 
   
}); 

</script>
 <body   >
    <h1>bbbbbbbbbbbbbbbbbbb
    </h1>


<form method=post action="">
    
<input type="text" name="" id="aaaa"  class="{required:true,minlength:3,maxlength:4,messages:{required:'请填写登录名'}}">


<pre>
jQuery.getPos = function (e)
{
	var l = 0;
	var t  = 0;
	var w = jQuery.intval(jQuery.css(e,'width'));
	var h = jQuery.intval(jQuery.css(e,'height'));
	var wb = e.offsetWidth;
	var hb = e.offsetHeight;
	while (e.offsetParent){
		l += e.offsetLeft + (e.currentStyle?jQuery.intval(e.currentStyle.borderLeftWidth):0);
		t += e.offsetTop  + (e.currentStyle?jQuery.intval(e.currentStyle.borderTopWidth):0);
		e = e.offsetParent;
	}
	l += e.offsetLeft + (e.currentStyle?jQuery.intval(e.currentStyle.borderLeftWidth):0);
	t  += e.offsetTop  + (e.currentStyle?jQuery.intval(e.currentStyle.borderTopWidth):0);
	return {x:l, y:t, w:w, h:h, wb:wb, hb:hb};
};
jQuery.getClient = function(e)
{
	if (e) {
		w = e.clientWidth;
		h = e.clientHeight;
	} else {
		w = (window.innerWidth) ? window.innerWidth : (document.documentElement && document.documentElement.clientWidth) ? document.documentElement.clientWidth : document.body.offsetWidth;
		h = (window.innerHeight) ? window.innerHeight : (document.documentElement && document.documentElement.clientHeight) ? document.documentElement.clientHeight : document.body.offsetHeight;
	}
	return {w:w,h:h};
};

<a id="aa"  href="#" >div1div1</a> 

jQuery.getScroll = function (e) 
{

	if (e) {
		t = e.scrollTop;
		l = e.scrollLeft;
		w = e.scrollWidth;
		h = e.scrollHeight;
	} else  {
		if (document.documentElement && document.documentElement.scrollTop) {
			t = document.documentElement.scrollTop;
			l = document.documentElement.scrollLeft;
			w = document.documentElement.scrollWidth;
			h = document.documentElement.scrollHeight;
		} else if (document.body) {
			t = document.body.scrollTop;
			l = document.body.scrollLeft;
			w = document.body.scrollWidth;
			h = document.body.scrollHeight;
		}
	}
	return { t: t, l: l, w: w, h: h };
};

jQuery.intval = function (v)
{
	v = parseInt(v);
	return isNaN(v) ? 0 : v;
};

jQuery.fn.ScrollTo = function(s) {
	o = jQuery.speed(s);
	return this.each(function(){
		new jQuery.fx.ScrollTo(this, o);
	});
};

jQuery.fx.ScrollTo = function (e, o)
{
	var z = this;
	z.o = o;
	z.e = e;
	z.p = jQuery.getPos(e);
	z.s = jQuery.getScroll();
	z.clear = function(){clearInterval(z.timer);z.timer=null};
	z.t=(new Date).getTime();
	z.step = function(){
		var t = (new Date).getTime();
		var p = (t - z.t) / z.o.duration;
		if (t >= z.o.duration+z.t) {
			z.clear();
			setTimeout(function(){z.scroll(z.p.y, z.p.x)},13);
		} else {
			st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t;
			sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l;
			z.scroll(st, sl);
		}
	};
	z.scroll = function (t, l){window.scrollTo(l, t)};
	z.timer=setInterval(function(){z.step();},13);
};


其实还更简单的办法：
$("html,body").animate({scrollTop: $("#box").offset().top}, 1000);


</pre>
</form>

<a href="Noname1.html">Noname1.html</a>


 </body>
</html>

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