var arr = new Array(); //数组定义标准形式，不要写成Array arr = new Array();
     var all = ""; //定义变量全部保存
     $("#UserBorough option").each(function () {
       var txt = $(this).text(); //获取单个text
       var val = $(this).val(); //获取单个value
       var node = "<" + txt + ">" + val + "</" + txt + ">";
       arr.push(node);
       all += node;
     });
     alert(all);
     alert(arr);