对于可见的“Submit order”按钮，哪种 Playwright 定位方式最稳健？

对于可见的“Submit order”按钮，哪种 Playwright 定位方式最稳健？

1. `page.getByRole("button", { name: "Submit order" })`
2. `page.locator("div:nth-child(7)")`
3. `page.locator(".blue.rounded.large")`