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<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2024/04/03/ES6%20Promise%E7%94%A8%E6%B3%95%20asyncawait%E5%BC%82%E6%AD%A5%E5%A4%84%E7%90%86%E5%90%8C%E6%AD%A5%E5%8C%96/" target="_blank">
ES6 Promise用法 asyncawait异步处理同步化
</a>
</h1>
<a class="index-excerpt index-excerpt__noimg" href="/2024/04/03/ES6%20Promise%E7%94%A8%E6%B3%95%20asyncawait%E5%BC%82%E6%AD%A5%E5%A4%84%E7%90%86%E5%90%8C%E6%AD%A5%E5%8C%96/" target="_blank">
<div>
promise定义 promise是解决异步的方法，本质上是一个构造函数，可以用它实例化一个对象。对象身上有resolve、reject、all，原型上有then、catch方法。promise对象有三种状态：pending（初识状态/进行中）、resolved或fulfilled（成功）、rejected（失败） pending 表示”待定的，将发生的”，相当于是一个初始状态。
</div>
</a>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2024-04-03 14:49" pubdate>
2024-04-03
</time>
</div>
<div class="post-meta mr-3 d-flex align-items-center">
<i class="iconfont icon-category"></i>
<span class="category-chains">
<span class="category-chain">
<a href="/categories/%E5%89%8D%E7%AB%AF/" class="category-chain-item">前端</a>
</span>
</span>
</div>
<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/es6/">#es6</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2024/04/03/es6%E4%B8%ADfor%E5%BE%AA%E7%8E%AF%E9%81%8D%E5%8E%86%E5%90%84%E7%A7%8D%E4%BD%BF%E7%94%A8%E5%9C%BA%E6%99%AF/" target="_blank">
es6中for循环遍历各种使用场景
</a>
</h1>
<a class="index-excerpt index-excerpt__noimg" href="/2024/04/03/es6%E4%B8%ADfor%E5%BE%AA%E7%8E%AF%E9%81%8D%E5%8E%86%E5%90%84%E7%A7%8D%E4%BD%BF%E7%94%A8%E5%9C%BA%E6%99%AF/" target="_blank">
<div>
for循环的各种使用场景 forEach 性能上小于for，for循环直接操作索引，没有额外的函数调用 for可以使用break终止，forEach不支持跳出循环，使用return时类似于for的continue，结束当次循环 forEach不支持await异步等待 map 对数组遍历不破坏原数组，将会创建一个新数组，按照原始数组元素顺序依次执行给定的函数，map方法非常适合用于处理数
</div>
</a>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2024-04-03 10:24" pubdate>
2024-04-03
</time>
</div>
<div class="post-meta mr-3 d-flex align-items-center">
<i class="iconfont icon-category"></i>
<span class="category-chains">
<span class="category-chain">
<a href="/categories/%E5%89%8D%E7%AB%AF/" class="category-chain-item">前端</a>
</span>
</span>
</div>
<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/es6-js/">#es6 js</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2024/03/28/github%E4%B8%8A%E6%9C%89%E8%B6%A3%E7%9A%84%E9%A1%B9%E7%9B%AE(%E5%80%BC%E5%BE%97star)/" target="_blank">
github上有趣的项目(值得star)
</a>
</h1>
<a class="index-excerpt index-excerpt__noimg" href="/2024/03/28/github%E4%B8%8A%E6%9C%89%E8%B6%A3%E7%9A%84%E9%A1%B9%E7%9B%AE(%E5%80%BC%E5%BE%97star)/" target="_blank">
<div>
类似 selenuium 的网页自动化工具 这是一款基于 Python 的网页自动化工具，支持 Chrome 和 Edge 等 Chromium 内核的浏览器。它将控制浏览器和收发请求两大功能合二为一，并提供了统一、简洁的接口，简单易用十分容易上手。该项目 v3.x 版本推出了 WebPage 摆脱对 selenium 的依赖，重新开发了底层逻辑，具有速度快、不易被网站识别、无需为不同版本浏览
</div>
</a>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2024-03-28 18:39" pubdate>
2024-03-28
</time>
</div>
<div class="post-meta mr-3 d-flex align-items-center">
<i class="iconfont icon-category"></i>
<span class="category-chains">
<span class="category-chain">
<a href="/categories/Git/" class="category-chain-item">Git</a>
</span>
</span>
</div>
<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/github-git/">#github git</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2024/03/27/feapder%E7%88%AC%E8%99%AB%E6%A1%86%E6%9E%B6%E4%B9%8B%E8%BD%BB%E9%87%8FAirSpider%E7%94%A8%E6%B3%95%E7%A4%BA%E4%BE%8B/" target="_blank">
feapder爬虫框架之轻量AirSpider用法示例
</a>
</h1>
<a class="index-excerpt index-excerpt__noimg" href="/2024/03/27/feapder%E7%88%AC%E8%99%AB%E6%A1%86%E6%9E%B6%E4%B9%8B%E8%BD%BB%E9%87%8FAirSpider%E7%94%A8%E6%B3%95%E7%A4%BA%E4%BE%8B/" target="_blank">
<div>
安装精简版 1pip install feapder 浏览器渲染版： 1pip install "feapder[render]" 完整版： 1pip install "feapder[all]" 三个版本区别： 精简版：不支持浏览器渲染、不支持基于内存去重、不支持入库mongo 浏览器渲染版：不支持基于内存去重、不支持入库mongo 完整版：支
</div>
</a>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2024-03-27 19:39" pubdate>
2024-03-27
</time>
</div>
<div class="post-meta mr-3 d-flex align-items-center">
<i class="iconfont icon-category"></i>
<span class="category-chains">
<span class="category-chain">
<a href="/categories/%E7%88%AC%E8%99%AB/" class="category-chain-item">爬虫</a>
</span>
</span>
</div>
<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/%E7%88%AC%E8%99%AB/">#爬虫</a>
</div>
</div>
</article>
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<a href="/2024/03/27/feapder%E7%88%AC%E8%99%AB%E6%A1%86%E6%9E%B6%E4%B9%8B%E4%BB%BB%E5%8A%A1TaskSpider%E7%94%A8%E6%B3%95%E7%A4%BA%E4%BE%8B/" target="_blank">
feapder爬虫框架之任务TaskSpider用法示例
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安装精简版 1pip install feapder 浏览器渲染版： 1pip install "feapder[render]" 完整版： 1pip install "feapder[all]" 三个版本区别： 精简版：不支持浏览器渲染、不支持基于内存去重、不支持入库mongo 浏览器渲染版：不支持基于内存去重、不支持入库mongo 完整版：支
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<a href="/tags/%E7%88%AC%E8%99%AB/">#爬虫</a>
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<a href="/2022/08/22/%E7%88%AC%E8%99%AB%E5%88%A9%E5%99%A8%20pyppeteer%20%E4%BD%BF%E7%94%A8%E6%8A%80%E5%B7%A7/" target="_blank">
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一、拦截器简单用法拦截器作用于单个Page，即浏览器中的一个标签页。每初始化一个Page都要添加一下拦截器。拦截器实际上是 通过给各种事件添加回调函数来实现的。 事件列表可参见：pyppeteer.page.Page.Events 常用拦截器： request：发出网络请求时触发 response：收到网络响应时触发 dialog：页面有弹窗时触发 使用request拦截器修改请求： 12
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用pandas生成excel 当我们有特殊的需求时，比如要修改excel的行宽列宽，还有字体样式等等 需求示例 代码实现123456789101112131415161718192021222324252627282930313233343536# -*- coding: utf-8 -*-import pandas as pdfrom datetime import datetime,
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<a href="/tags/pandas-python-%E6%95%B0%E6%8D%AE%E5%88%86%E6%9E%90/">#pandas python 数据分析</a>
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当我们想将时间戳转换成特定格式的时间字符串，比如带有年月日，以下写法可能会出现报错 1datetime.strftime(datetime.fromtimestamp(1655481600), &#x27;%Y年%m月%d日 %H:%M:%S&#x27;) UnicodeEncodeError: ‘locale’ codec can’t encode character ‘\u5e74
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<a href="/2021/07/08/Python%20try...except...%E6%97%B6%E6%8D%95%E8%8E%B7%E5%BC%82%E5%B8%B8%E6%97%B6%E5%85%B7%E4%BD%93%E6%96%87%E4%BB%B6%E5%92%8C%E8%A1%8C%E6%95%B0/" target="_blank">
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1234567891011121314def try_exception_test(): try: a = 0 b = 1/a print(b) except Exception as e: print(e) # 发生异常所在的文件 print(e.__traceback__.tb_frame.f_
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原始数据：list中嵌套dict的数据格式 转换结果：数结构的数据，children字段嵌套的形式，适用于前端树形结构的渲染 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071
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