1、点击菜单中的file菜单,弹出了下拉菜单选中为settings选项

2、点击advanced选项

3、勾选上convert undefined operands totext in concatenations选项

4、勾选上convert undefined operands totext in concatenations选项之后,点击ok

1、点击菜单中的file菜单,弹出了下拉菜单选中为settings选项
2、点击advanced选项
3、勾选上convert undefined operands totext in concatenations选项
4、勾选上convert undefined operands totext in concatenations选项之后,点击ok