滾動條定位

首先來乙個例子：

this is some text. this is some text. this is some text. this is some text. this is some text. this is some text.

this is some text. this is some text. this is some text. this is some text. this is some text. this is some text. 
this is some text. this is some text. this is some text. this is some text. this is some text. this is some text. 
this is some text. this is some text. this is some text. this is some text. this is some text. this is some text. 
this is some text. this is some text. this is some text. this is some text. this is some text. this is some text. 
this is some text. this is some text. this is some text. this is some text. this is some text. this is some text.  
把 scroll top offset 設定為 100px
獲得 scroll top offset
注：滾動條所在的div必須有overflow屬性且value不能為hidden 
請看複雜情況：
這種情況主要用於使用了滾動條外掛程式的情況，一眼看去不知道那個div在滾動，隨意找乙個div是不能正常工作的。
如果想加入一點動畫效果，可以適應animate方法
var scrolltop = 100;
$(".form").parent().parent().animate("scrolltop: "+ scrolltop +"'px'", 400);

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