如何在JavaScript中动态创建下拉菜单列表？

最初，我通过以下方式生成了一个

下拉菜单

：

我添加了更多关于如何制作下拉菜单的细节

        <div class="well sidebar-nav">
            <img src="building.gif" style="display: block;margin-left:auto; margin-right:auto;max-width:100%; max-height:100%;" />
            <div class="dropdown" style="padding-left: 20px; padding-top:5px;">
                <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" style="display: block;margin-left:auto; margin-right:auto;">
                    Select A Building
                    <span class=" caret">
                    </span>
                </button>

                <ul id="myul" class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1"></ul>

            </div>
        </div>
    </div><!--/span2-->

选择一个建筑

现在，我编写了以下代码：

    var buildingList=[
          {
            "BuildingName": "Adler Journalism and Mass Communication Building",
            "BuildingNumber": "0456"
          },
          {
            "BuildingName": "Art Building",
            "BuildingNumber": "0021"
           } 
    ];

    <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" style="display: block;margin-left:auto; margin-right:auto;">
                        Select A Building
                        <span class=" caret">
                        </span>
                    </button>
    <ul id="myul" class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
    </ul>

     <script type="text/javascript">
      var out = "";
      var ul = document.getElementById("myul");
      for (i = 0; i < buildingList.length; i++) {
                out = ' <li role="presentation"><a role="menuitem" tabindex="-1" href=" ' + buildingList[i].BuildingName + '  "> ' + buildingList[i].BuildingName + '   </a></li>';
                 var li = document.createElement("li");
                 var t = document.createTextNode(out);
                 li.appendChild(t);
                 ul.appendChild(li);
    }
    </script>

var buildingList=[
{
“建筑名称”：“阿德勒新闻与大众传播大楼”，
“建筑编号”：“0456”
},
{
“建筑名称”：“艺术建筑”，
“建筑编号”：“0021”
} 
];
选择一个建筑


var out=“”；
var ul=document.getElementById（“myul”）；
对于（i=0；i