r41/notes.html · 约 2724 字符
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12 <div class="top"><span class="role">学生端</span><span style="margin-left:auto;font-size:12px;opacity:.85">驰旭教育</span></div>
13 <h1>学习笔记</h1>
14 <div class="sub">前端工程师全栈实战训练营 · 共 18 条</div>
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17 <div style="font-size:13px;font-weight:600;margin-bottom:8px">📍 记录到 第 8 章 8-3 · 12:36</div>
18 <textarea placeholder="写下你的学习心得、重点或疑问…">fillna() 可指定固定值或方法填充，method='ffill' 表示用前一个值填充，处理时间序列缺失很好用。</textarea>
19 <div class="tb"><span>🅱 加粗</span><span>🖊 高亮</span><span>🔗 链接时间点</span><span style="margin-left:auto"><button class="btn" style="padding:6px 18px">保存笔记</button></span></div>
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21<div class="section-title"><span>我的笔记</span><span class="more">按章节</span></div>
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23 <div class="nh"><span class="tag blue">第 8 章</span><span>8-3 缺失值处理</span><span class="ts">刚刚</span></div>
24 <div class="nb">dropna() 直接删除含缺失的行/列，axis=0 删行、axis=1 删列；数据量大时慎用，容易误删。</div>
25 <div class="nq">⏱ 关联时间点 08:12 · 点击跳转视频</div>
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28 <div class="nh"><span class="tag violet">第 6 章</span><span>6-2 函数与作用域</span><span class="ts">昨天</span></div>
29 <div class="nb">闭包会保留外层函数的变量引用，注意循环里用闭包的经典坑：用默认参数或立即执行函数固定当前值。</div>
30 <div class="nq">⏱ 关联时间点 15:40 · 点击跳转视频</div>
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33 <div class="nh"><span class="tag teal">第 3 章</span><span>3-1 CSS 弹性布局</span><span class="ts">3 天前</span></div>
34 <div class="nb">flex:1 是 flex-grow/shrink/basis 的简写，等价于 1 1 0%；justify-content 管主轴、align-items 管交叉轴。</div>
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