为什么这不起作用(在空选择列表上操作$(function(){$.getJSON("/RequestX/GetRequestTypes/",showRequestTypes);});functionshowRequestTypes(data,textStatus){$.each(data,function(){varoption=newOption(this.RequestTypeName,this.RequestTypeID);//UseJquerytogetselectlistelementvardropdownList=$("#requestTypes");if($.browse