学习笔记——使用弹性布局

朴灿烈づ我的快乐病毒、 2022-11-20 08:22 217阅读 0赞

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### 弹性布局：为盒模型提供了较大的灵活性 ###

> 定义：任何盒子设置了display属性为flex，则该盒子本身开启了弹性布局。webkit内核的浏览器则需要加-webkit前缀。
> 
> 弹性容器：display属性设置为flex的盒子。
> 
> 弹性项目：弹性容器的子元素（孙子元素不包括在内）。
> 
> “主轴”和“交叉轴”是弹性容器内存在的两个轴，它们永远是垂直的。

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### 弹性容器中的属性设置及其表现： ###

> **1.设置display: flex开启弹性布局**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70][]

> **2.设置flex-wrap: nowrap（默认值） | wrap（换行） | wrap-reverse（换行但方向翻转）**
> 
> **如果弹性项目在主轴上放不下时，是否允许换行（是否允许出现多根主轴）。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 1][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 2][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 3][]

> **3.设置flex-direction: row（默认）| row-reverse | column（按列正方向） | coulmn-reverse**
> 
> **控制弹性容器内部主轴的方向。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 4][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 5][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 6][]             ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 7][]

> **4.设置justuify-content: flex-start（默认）| flex-end（从结尾开始） | center | space-between（与交叉轴两端对齐，间隔平均分布） | space-around（每个盒子两侧间隔相同）**
> 
> **弹性项目在主轴上的对齐的方式。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 8][]            ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 9][]           ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 10][]            ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 11][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 12][]

> **5.设置align-items: stretch（默认） | flex-start | flex-end | center | baseline**
> 
> **弹性项目在交叉中上的对齐方式。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 13][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 14][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 15][]        ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 16][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 17][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 18][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 19][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 20][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 21][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 22][]          ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 23][]

### 弹性项目中的属性设置及其表现： ###

> **1. 设置flex-grow: 0（默认）| 正整数**
> 
> **当主轴方向还存在剩余空间，弹性项目如何瓜分（按比重）。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 24][]

> **2.设置flex-basis: auto（默认）| 任意有效长度**
> 
> **设置弹性项目参与主轴剩余空间计算的数值。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 25][]

> **3.设置flex-shrink: 1 | 正整数**
> 
> **当主轴上放不下弹性项目时，如何进行收缩。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 26][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 27][]

> 5.设置align-self: inherit（默认）| stretch | flex-start | flex-end | center
> 
> 设置弹性项目自身在交叉轴上的位置。会覆盖弹性容器中设置的align-items。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 28][]

> 6.设置order：整数
> 
> 决定弹性项目的摆放顺序。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzM5MTI2_size_16_color_FFFFFF_t_70 29][]

> 总结：开启弹性布局后，弹性项目不需要讨论是什么类型的盒子了，弹性项目具有包裹性，设置宽高有效。也不要设置浮动和清除浮动，这对弹性项目无效，当然设置vertical-align之类的也无效。定位还可以使用，弹性项目也可以再作为弹性容器开启弹性布局。

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