修复部分情况下删除单选题题选项后，后面再添加的单选题与前面单选题name有重复的BUG

app/views/poll/_poll_form.html.erb

@@ -16,7 +16,7 @@
       //单选题
       function add_single_answer(doc)
       {
-          doc.parent().after("<li class='ur_item'><label>选项<span class='ur_index'></span>：</label><input type='text' name='question_answer["+(doc.parent().siblings("li").length + 1)+"]' placeholder='新建选项'/>" +
+          doc.parent().after("<li class='ur_item'><label>选项<span class='ur_index'></span>：</label><input type='text' name='question_answer["+new Date().getTime()+"]' placeholder='新建选项'/>" +
               "<a class='icon_add' title='向下插入选项' onclick='add_single_answer($(this));'></a><a class='icon_remove'  title='删除' onclick='remove_single_answer($(this))'></a>"+
               "</li><div class='cl'></div>");
       }