浏览器操作作业 · 页面导航

"""
历史导航三部曲 —— 完整示例
"""
from selenium import webdriver

driver = webdriver.Chrome()
driver.implicitly_wait(1)

# ===== 构建 history stack =====
driver.get("https://www.page-a.com")     # stack: [A]         cursor → A
driver.get("https://www.page-b.com")     # stack: [A, B]      cursor → B
driver.get("https://www.page-c.com")     # stack: [A, B, C]   cursor → C

# ===== back() / forward() =====
driver.back()                            # cursor → B, 显示 page-b
driver.back()                            # cursor → A, 显示 page-a
driver.back()                            # ⚠️ 到顶了！不会报错，静默 no-op
print(driver.current_url)                # → 还是 page-a

driver.forward()                         # cursor → B
driver.forward()                         # cursor → C
driver.forward()                         # ⚠️ 到底了！也不会报错

# ===== refresh() =====
driver.refresh()
# 等价于：在当前页重新发送一次请求（浏览器的 F5）
# ⚠️ 不等价于 driver.get(driver.current_url)
#    refresh() 会带上 cache-control / 表单重提交提示
#    get() 就是一次全新的导航

# ===== get() 会截断 forward 队列 =====
driver.back()                            # cursor → B
driver.get("https://www.page-d.com")     # stack 变成 [A, B, D] ← C 被砍掉！
# 此时再 forward() 不会回到 C 了 —— 它已经被 purge 掉

driver.quit()