//后端代碼public JsonResult SendData()    {        return Json( new {username="劉偉",teacherid="2432012522" });    }    //前端代碼<div class="box5" style="position:relative;">    <!-- 背景圖的div -->    <img style="position:absolute;margin-left: 5%;margin-top: 9%" src="~/Content/themes/portrait.png" width=28% height=50% />    <img src="~/Content/themes/background.jpg" width=100% height=100% />    <div class="FONT4" style="position:absolute; z-index:2; top:15px">姓名：劉偉</div>    //怎么把這個“劉偉”替換成動態的，由后端發送的？    <div class="FONT4" style="position:absolute; z-index:2; top:100px">教工號：2432012522</div>    //怎么把這個“2432012522”替換成動態的，由后端發送的？</div>