本人写的一个javascr ipt元素可拖动代码，供大家学习，因为是练习的，所以不会写的太好，但新手门学习下应该不成问题.-I wrote a javascr ipt element draggable code for everyone to learn, because in practice, so do not write very good, but under the learning of the novice doors should not be a problem.

智能定位页面元素，使元素一直定位在页面顶端，兼容手机，html5 -Intelligent positioning of page elements, so that element has been positioned in the top of the page, compatible mobile phone, html5

有限单元法求解一阶偏微分方程，使用的方法是加权余量法，方法快捷准确-Finite element method to solve the first-order partial differential equations, a method using a weighted residual method, fast and accurate method