前端性能优化-3-渲染优化

╰+哭是因爲堅強的太久メ 2023-01-07 13:24 176阅读 0赞

# 3-1 浏览器原理浏览器渲染原理和关键渲染路径 #

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无论首次加载和样式发生变化都会经历这几步，然后呈现给用户。  
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代码始终要被解释器转换电脑理解的数据结构。  
浏览器下载html读取html文本，先把文本转换单个字符，一个一个读取》通过<>进行识别，把读到的尖括号里的内容转换为节点对象放入链型数据结构里（上图的树形结构也就是DOM）。

## css部分 ##

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### 第一步 ###

构建俩个对象模型  
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### 第二步 ###

然后俩棵树合并  
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合并之后会把需要显示的留下，不需要显示的去掉，注意这里的dispaly：none的span节点会被去掉。  
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有了这棵树后浏览器就知道如何布局，然后进行布局绘制。稍后说。

--------------------

*  第一步触发视图变  
    只要触发视图变化（例如用js改变dom等）都会执行以下流程（关键渲染路径）。
 *  第二步 对样式重新进行计算
 *  第三步 布局（要知道元素大小位置）
 *  第四步 绘制
 *  第五步 合成，浏览器为了提高效率，不同的对象会有不同的图层，最终会合成在一起。  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 7]

理论上这五步都会经历，但还有另一种情况，某些样式不影响布局和绘制的情况，浏览器会省略这几步进行优化，不重新布局和绘制，下面介绍。

# 3-2 回流与重绘, 如何避免布局抖动 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 8]绘制是一个非常高的操作  
可以不走布局和绘制的是动画，通过GPU加速》直接走复合步骤。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 9]  
display:none 去掉元素。

## 案例 查看重绘耗时 ##

performance》开始录制》点击L事件开始》放大观察  
此时downLoad事件后是有layout的  
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## 布局抖动 ##

添加动画后明显卡顿  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 11]  
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## 原因 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 13]

## 避免 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 14]

## 避免回流 ##

如果改变元素大小避免用width等发生回流的操作，使用transform（不会导致回流，只触发合成阶段），react就用了vdom，这样就减少了回流。

## 读写分离 ##

批量读，批量写，下面介绍的FastDom就是利用这个。

# 3-3 使用FastDom【防止布局抖动的利器】 #

批量读，批量写  
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## fastdom官方demo ##

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用强布局明显卡顿。  
使用fastdom后好一点。

## 代码改造 ##

主要问题是连续读写操作。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 17]  
改造后，读的套在measure里，写的套在mutate里  
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运行，动画明显流畅了很多  
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# 3-4 复合线程与图层【深入渲染流水线的最后一站】 #

复合》把页面拆成多个图层，这样页面发生某些变化，那么只需处理某图层即可提高性能。  
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1.如何拆分图层是浏览器的规则决定的，例如把不会影响其他元素的元素放在单独图层，那么这个单独的图层发生变化只会修改它，不会影响其他图层。  
2.我们可以把一些元素独立出来提高性能。

点击performance中的frame  
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下面的图标记了，只触发复合不重新布局重绘的方法。  
位移transltae  
改变大小scale  
旋转  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 22]

## 案例 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 23]

## 观察是否只发生了复合 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 24]  
这里只发生了复合 composite layers

# 3-5 避免重绘【必学，加速页面呈现】 #

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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 26]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 27]没有发生回流重新计算样式好跳过布局进入合成阶段。  
改变代码，不使用transform  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 28]  
performance中搜索render然后勾选paint flashing，会把重绘的部分标记出来  
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点击旋转后，一直再回流  
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也影响了其他元素重绘  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 31]  
利用willChange属性把元素提取到单独图层。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 32]  
opacity测试（opacity只会重绘不创新布局）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 33]  
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总结  
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# 3-6 高频事件防抖【解救页面卡顿的秘药】 #

高频事件（scroll，mousemove，pointermove等）  
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raf应用  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 38]  
raf是布局和绘制前做的（也就是处理完相关操作后再绘制）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 39]  
修改代码后 动画变得很流畅  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 40]

# 3-7 React时间调度实现【中高级前端需要了解的React调度原理】 #

fiber（把批量dom任务拆解成细小任务，保证了效率的同时也保证了用户的交互）的实现就是基于raf  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 41]  
requestIdleCb利用16.7ms空闲时间去做一些事情，react为了兼容浏览器就用raf模拟了。  
下面是一帧的渲染周期  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 42]

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