Python自动化神器Playwright使用

安装
```
pip install playwright
playwright install
```
用法
```
from playwright.sync_api import sync_playwright

with sync_playwright() as p:
    browser = p.chromium.launch()
    page = browser.new_page()
    page.goto("http://playwright.dev")
    print(page.title())
    browser.close()
```
注意事项
1.Response.body()用法
-返回带有响应正文的缓冲区
```
from playwright.sync_api import sync_playwright, Response

with sync_playwright() as p:
    browser = p.chromium.launch()
    page = browser.new_page()
    response = page.goto(url)
    response_decode = Response.body(response).decode(encoding="UTF-8")
```
注意：使用Response.body()需要import Response；
官方文档response.body()写法错误，r应该为大写，且需要一个参数
2.返回当前页面资源
```
response = page.reload(**kwargs)
```
3.获取元素边界值
```
box = page.locator("text=请按住滑块，拖动到最右边").bounding_box()
```
4.特殊按键
The Meta key. Allows issuing special command inputs. This is the Windows logo key, or the Command or ⌘ key on Mac keyboards.
5.调试
可以在语句中加入page.pause()来设置断点，可以在断点处人机交互解决问题，比如输入验证码。重新载入正常网页后，可以在playwright inspect中点击resume继续执行剩余代码。
6.滚动页面
```
page.evaluate("window.scrollBy(x, y)") #滚动偏移量

page.evaluate("window.scrollTo(x, y)") #滚动到指定坐标
```
参考1:https://github.com/microsoft/playwright-python/issues/902

参考2：https://developer.mozilla.org/zh-CN/docs/Web/API/Window/scrollBy
7.要在浏览器上下文中计算的JavaScript表达式
```
page.evaluate（表达式，**kwargs
```