var form = new mini.Form("#form1"); Error: form element not nullmini.Form()miniui.js%20line%204%20%3E%20eval:1tv_basic_search()pwjxsqd.jsp:67onTabsActiveChanged/<()pwjxsqd.jsp:43mini.Component.prototype.fire()miniui.js%20line%204%20%3E%20eval:1._doLoadTab/$<()miniui.js%20line%204%20%3E%20eval:1K/<()
var form = new mini.Form("#" + view_datagrid_searchform);这行代码报错是什么原因