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| @@ -1,7 +1,6 @@ | ||
| --- | ||
| title: 'React -- Hooks' | ||
| date: 2022-11-27T11:28:43 | ||
| +08:00 | ||
| tags: [React] | ||
| draft: true | ||
| --- | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| --- | ||
| title: 'Vue 源码中的设计美学' | ||
| date: 2024-04-30 | ||
| series: [] | ||
| categories: [Vue] | ||
| weight: | ||
| --- | ||
|
|
||
| ## 为什么能通过 this.xxx 就能访问到对应的 methods 和 data | ||
|
|
||
| ```js {oppen=false} | ||
| // test | ||
| function sayHello() {} | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -4,7 +4,14 @@ | |
| <link>http://localhost:1313/categories/</link> | ||
| <description>Categories - 分类 - Hello World</description> | ||
| <generator>Hugo -- gohugo.io</generator><language>zh-CN</language><managingEditor>[email protected] (EricYuan)</managingEditor> | ||
| <webMaster>[email protected] (EricYuan)</webMaster><lastBuildDate>Wed, 21 Feb 2024 00:00:00 +0000</lastBuildDate><atom:link href="http://localhost:1313/categories/" rel="self" type="application/rss+xml" /><item> | ||
| <webMaster>[email protected] (EricYuan)</webMaster><lastBuildDate>Tue, 30 Apr 2024 00:00:00 +0000</lastBuildDate><atom:link href="http://localhost:1313/categories/" rel="self" type="application/rss+xml" /><item> | ||
| <title>Vue</title> | ||
| <link>http://localhost:1313/categories/vue/</link> | ||
| <pubDate>Tue, 30 Apr 2024 00:00:00 +0000</pubDate><author> | ||
| <name>EricYuan</name> | ||
| </author><guid>http://localhost:1313/categories/vue/</guid> | ||
| <description><![CDATA[]]></description> | ||
| </item><item> | ||
| <title>Algorithm</title> | ||
| <link>http://localhost:1313/categories/algorithm/</link> | ||
| <pubDate>Wed, 21 Feb 2024 00:00:00 +0000</pubDate><author> | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| <rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"> | ||
| <channel> | ||
| <title>Vue - 分类 - Hello World</title> | ||
| <link>http://localhost:1313/categories/vue/</link> | ||
| <description>Vue - 分类 - Hello World</description> | ||
| <generator>Hugo -- gohugo.io</generator><language>zh-CN</language><managingEditor>[email protected] (EricYuan)</managingEditor> | ||
| <webMaster>[email protected] (EricYuan)</webMaster><lastBuildDate>Tue, 30 Apr 2024 00:00:00 +0000</lastBuildDate><atom:link href="http://localhost:1313/categories/vue/" rel="self" type="application/rss+xml" /><item> | ||
| <title>Vue 源码中的设计美学</title> | ||
| <link>http://localhost:1313/vue%E6%BA%90%E7%A0%81%E4%B8%AD%E7%9A%84%E8%AE%BE%E8%AE%A1%E7%BE%8E%E5%AD%A6/</link> | ||
| <pubDate>Tue, 30 Apr 2024 00:00:00 +0000</pubDate><author> | ||
| <name>EricYuan</name> | ||
| </author><guid>http://localhost:1313/vue%E6%BA%90%E7%A0%81%E4%B8%AD%E7%9A%84%E8%AE%BE%E8%AE%A1%E7%BE%8E%E5%AD%A6/</guid> | ||
| <description><![CDATA[ 为什么能通过 this.xxx 就能访问到对应的 methods 和 datafunction test { this.name = 'hello world' } ]]></description> | ||
| </item><item> | ||
| <title>Vue2响应式原理</title> | ||
| <link>http://localhost:1313/vue%E5%93%8D%E5%BA%94%E5%BC%8F%E5%8E%9F%E7%90%86/</link> | ||
| <pubDate>Wed, 26 Oct 2022 09:58:34 +0800</pubDate><author> | ||
| <name>EricYuan</name> | ||
| </author><guid>http://localhost:1313/vue%E5%93%8D%E5%BA%94%E5%BC%8F%E5%8E%9F%E7%90%86/</guid> | ||
| <description><![CDATA[核心VUE2 的响应式原理实现主要基于： | ||
| Object.defineProperty(obj, prop, descriptor) 观察者模式 init - reactive 化Vue 初始化实例时，通过 Object.defineProperty 为 data 中的所有数据添加 setter/getter。这个过程称为 reactive 化。 | ||
| 所以： | ||
| vue 监听不到 data 中的对象属性的增加和删除，必须在初始化的时候就声明好对象的属性。 | ||
| 解决方案：或者使用 Vue 提供的 $set 方法；也可以用 Object.assign({}, source, addObj) 去创建一个新对象来触发更新。 | ||
| Vue 也监听不到数组索引和长度的变化，因为当数据是数组时，Vue 会直接停止对数据属性的监测。至于为什么这么做，尤大的解释是：解决性能问题。 | ||
| 解决方案：新增用 $set，删除用 splice，Vue 对数组的一些方法进行了重写来实现响应式。 | ||
| 看下 defineReactive 源码： | ||
| // 以下所有代码为简化后的核心代码，详细的见vue2的gihub仓库哈 export function defineReactive(obj: object, key: string, val?: any, ...otehrs) { const dep = new Dep() Object.defineProperty(obj, key, { enumerable: true, configurable: true, get: function reactiveGetter() { if (Dep.]]></description> | ||
| </item></channel> | ||
| </rss> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| <!DOCTYPE html> | ||
| <html lang="zh-CN"> | ||
| <head> | ||
| <title>http://localhost:1313/categories/vue/</title> | ||
| <link rel="canonical" href="http://localhost:1313/categories/vue/"> | ||
| <meta name="robots" content="noindex"> | ||
| <meta charset="utf-8"> | ||
| <meta http-equiv="refresh" content="0; url=http://localhost:1313/categories/vue/"> | ||
| </head> | ||
| </html> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -4,7 +4,7 @@ | |
| <link>http://localhost:1313/</link> | ||
| <description>A website documenting front-end technology and everyday life</description> | ||
| <generator>Hugo -- gohugo.io</generator><language>zh-CN</language><managingEditor>[email protected] (EricYuan)</managingEditor> | ||
| <webMaster>[email protected] (EricYuan)</webMaster><lastBuildDate>Wed, 21 Feb 2024 00:00:00 +0000</lastBuildDate> | ||
| <webMaster>[email protected] (EricYuan)</webMaster><lastBuildDate>Tue, 30 Apr 2024 00:00:00 +0000</lastBuildDate> | ||
| <atom:link href="http://localhost:1313/index.xml" rel="self" type="application/rss+xml" /> | ||
| <item> | ||
| <title>Mysql_1_基础</title> | ||
|
|
@@ -120,13 +120,11 @@ useMemo 是加在数据上的缓存，而 memo api 是加在组件上的，只 | |
| useCallbackconst cachedFn = useCallback(fn, dependencies) | ||
| reference useMemo useCallback ]]></description> | ||
| </item><item> | ||
| <title>滑动窗口</title> | ||
| <link>http://localhost:1313/%E6%BB%91%E5%8A%A8%E7%AA%97%E5%8F%A3/</link> | ||
| <pubDate>Wed, 21 Feb 2024 00:00:00 +0000</pubDate><author> | ||
| <title>Vue 源码中的设计美学</title> | ||
| <link>http://localhost:1313/vue%E6%BA%90%E7%A0%81%E4%B8%AD%E7%9A%84%E8%AE%BE%E8%AE%A1%E7%BE%8E%E5%AD%A6/</link> | ||
| <pubDate>Tue, 30 Apr 2024 00:00:00 +0000</pubDate><author> | ||
| <name>EricYuan</name> | ||
| </author><guid>http://localhost:1313/%E6%BB%91%E5%8A%A8%E7%AA%97%E5%8F%A3/</guid> | ||
| <description><![CDATA[核心滑动窗口的核心就是维持一个 [i..j) 的区间窗口，在数据上游走，来获取到需要的信息，在数组,字符串等中的表现，往往如下： | ||
| function slideWindow() { // 前后快慢双指针 let left = 0 let right = 0 /** 具体的条件逻辑根据实际问题实际处理，多做练习 */ while(slide condition) { window.push(s[left]) // s 为总数据（字符串、数组） right++ while(shrink condition) { window.shift(s[left]) left++ } } } 滑动窗口的算法时间复杂度为 O(n)，适用于处理大型数据集 | ||
| 练一练 lc.3 无重复字符的最长子串/** * @param {string} s * @return {number} */ var lengthOfLongestSubstring = function (s) { let max = 0 let l = 0, r = 0 let window = {} while (r < s.]]></description> | ||
| </author><guid>http://localhost:1313/vue%E6%BA%90%E7%A0%81%E4%B8%AD%E7%9A%84%E8%AE%BE%E8%AE%A1%E7%BE%8E%E5%AD%A6/</guid> | ||
| <description><![CDATA[ 为什么能通过 this.xxx 就能访问到对应的 methods 和 datafunction test { this.name = 'hello world' } ]]></description> | ||
| </item></channel> | ||
| </rss> | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -4,7 +4,7 @@ | |
| <link>http://localhost:1313/posts/</link> | ||
| <description>所有文章 | Hello World</description> | ||
| <generator>Hugo -- gohugo.io</generator><language>zh-CN</language><managingEditor>[email protected] (EricYuan)</managingEditor> | ||
| <webMaster>[email protected] (EricYuan)</webMaster><lastBuildDate>Wed, 21 Feb 2024 00:00:00 +0000</lastBuildDate><atom:link href="http://localhost:1313/posts/" rel="self" type="application/rss+xml" /><item> | ||
| <webMaster>[email protected] (EricYuan)</webMaster><lastBuildDate>Tue, 30 Apr 2024 00:00:00 +0000</lastBuildDate><atom:link href="http://localhost:1313/posts/" rel="self" type="application/rss+xml" /><item> | ||
| <title>Mysql_1_基础</title> | ||
| <link>http://localhost:1313/mysql_1/</link> | ||
| <pubDate>Thu, 30 Nov 2023 15:42:23 +0800</pubDate><author> | ||
|
|
@@ -118,13 +118,11 @@ useMemo 是加在数据上的缓存，而 memo api 是加在组件上的，只 | |
| useCallbackconst cachedFn = useCallback(fn, dependencies) | ||
| reference useMemo useCallback ]]></description> | ||
| </item><item> | ||
| <title>滑动窗口</title> | ||
| <link>http://localhost:1313/%E6%BB%91%E5%8A%A8%E7%AA%97%E5%8F%A3/</link> | ||
| <pubDate>Wed, 21 Feb 2024 00:00:00 +0000</pubDate><author> | ||
| <title>Vue 源码中的设计美学</title> | ||
| <link>http://localhost:1313/vue%E6%BA%90%E7%A0%81%E4%B8%AD%E7%9A%84%E8%AE%BE%E8%AE%A1%E7%BE%8E%E5%AD%A6/</link> | ||
| <pubDate>Tue, 30 Apr 2024 00:00:00 +0000</pubDate><author> | ||
| <name>EricYuan</name> | ||
| </author><guid>http://localhost:1313/%E6%BB%91%E5%8A%A8%E7%AA%97%E5%8F%A3/</guid> | ||
| <description><![CDATA[核心滑动窗口的核心就是维持一个 [i..j) 的区间窗口，在数据上游走，来获取到需要的信息，在数组,字符串等中的表现，往往如下： | ||
| function slideWindow() { // 前后快慢双指针 let left = 0 let right = 0 /** 具体的条件逻辑根据实际问题实际处理，多做练习 */ while(slide condition) { window.push(s[left]) // s 为总数据（字符串、数组） right++ while(shrink condition) { window.shift(s[left]) left++ } } } 滑动窗口的算法时间复杂度为 O(n)，适用于处理大型数据集 | ||
| 练一练 lc.3 无重复字符的最长子串/** * @param {string} s * @return {number} */ var lengthOfLongestSubstring = function (s) { let max = 0 let l = 0, r = 0 let window = {} while (r < s.]]></description> | ||
| </author><guid>http://localhost:1313/vue%E6%BA%90%E7%A0%81%E4%B8%AD%E7%9A%84%E8%AE%BE%E8%AE%A1%E7%BE%8E%E5%AD%A6/</guid> | ||
| <description><![CDATA[ 为什么能通过 this.xxx 就能访问到对应的 methods 和 datafunction test { this.name = 'hello world' } ]]></description> | ||
| </item></channel> | ||
| </rss> | ||
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