修复表单项label长度过长显示异常和支持label显示html --- fix1

src/components/app-form-item/app-form-item.less

@@ -10,7 +10,9 @@
   }
   .app-form-item-label {
       padding: 6px 10px 6px 0px;
-
+      overflow: hidden;
+      text-overflow: ellipsis;
+      white-space: nowrap;
   }
 }