一些css 技巧的记录

记录一下，忘记的时候翻一翻的CSS 技巧。

1. input 输入框的样式

    如下，box-sizing 设为border-box 且 左右 padding 有.1rem ，这样子输入框内部就可以有一个比较友好的内边距。 

    .search-input
      box-sizing: border-box
      width: 100%
      height: .62rem
      padding: 0 .1rem
      line-height: .62rem
      text-align: center
      border-radius: .06rem
      color: #666

2. border-bottom 

给元素添加一个底部的border

后者是添加底部与顶部的border

如下，调整了border 的颜色

<template>
  <div class="list">
    <div class="area">
      <div class="title border-topbottom">当前城市</div>
    </div>
    <div class="area">
      <div class="title border-topbottom">热门城市</div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'CityList'
}
</script>

<style lang="stylus" scoped>
  @import '~styles/variables.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .title
    line-height: .44rem
    background: #eee
    padding-left: .2rem
    color: #666
    font-size: .26rem
</style>

3. float 响应式 布局 简单案例

父组件 overflow 设置为hidden 可以消除塌陷问题。

父元素中每行显示三个子元素，且父元素右边留出一小列。

<template>
  <div class="list">
    <div class="area">
      <div class="title border-topbottom">当前城市</div>
      <div class="button-list">
        <div class="button-wraper">
          <div class="button">北京</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'CityList'
}
</script>

<style lang="stylus" scoped>
  @import '~styles/variables.styl'
  .title
    line-height: .44rem
    background: #eee
    padding-left: .2rem
    color: #666
    font-size: .26rem
  .button-list
    overflow: hidden
    padding: .1rem .6rem .1rem .1rem
    .button-wraper
      float: left
      width: 33.33%
      .button
        text-align: center
        margin: .1rem
        padding: .1rem 0
        border: .02rem solid #ccc
        border-radius: .06rem
</style>

3. 元素撑开整个页面（头部预留出位置），这样屏蔽掉浏览器本身的右侧滑动。

 .list 中内容

<template>
  <div class="list">
    <div class="area">
      <div class="title border-topbottom">当前城市</div>
      <div class="button-list">
        <div class="button-wraper">
          <div class="button">北京</div>
        </div>
      </div>
    </div>
    <div class="area">
      <div class="title border-topbottom">热门城市</div>
      <div class="button-list">
        <div class="button-wraper">
          <div class="button">北京</div>
        </div>
        <div class="button-wraper">
          <div class="button">北京</div>
        </div>
        <div class="button-wraper">
          <div class="button">北京</div>
        </div>
        <div class="button-wraper">
          <div class="button">北京</div>
        </div>
        <div class="button-wraper">
          <div class="button">北京</div>
        </div>
      </div>
    </div>
    <div class="area">
      <div class="title border-topbottom">A</div>
      <div class="item-list">
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
      </div>
    </div>
    <div class="area">
      <div class="title border-topbottom">A</div>
      <div class="item-list">
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
      </div>
    </div>
    <div class="area">
      <div class="title border-topbottom">A</div>
      <div class="item-list">
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
        <div class="item border-bottom">阿拉尔</div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'CityList'
}
</script>

<style lang="stylus" scoped>
  @import '~styles/variables.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    overflow: hidden
  .title
    line-height: .44rem
    background: #eee
    padding-left: .2rem
    color: #666
    font-size: .26rem
  .button-list
    overflow: hidden
    padding: .1rem .6rem .1rem .1rem
    .button-wraper
      float: left
      width: 33.33%
      .button
        text-align: center
        margin: .1rem
        padding: .1rem 0
        border: .02rem solid #ccc
        border-radius: .06rem
  .item-list
    .item
      line-height: .76rem
      padding-left: .2rem
</style>

4. ul 中li 实现垂直水平居中

使用display flex

<template>
  <ul class="list">
    <li class="item">A</li>
    <li class="item">A</li>
    <li class="item">A</li>
    <li class="item">A</li>
    <li class="item">A</li>
    <li class="item">A</li>
  </ul>
</template>

<script>
import Bscroll from 'better-scroll'
export default {
  name: 'CityAlphabet'
}
</script>

<style lang="stylus" scoped>
  @import '~styles/variables.styl'
  .list
    display: flex
    flex-direction: column
    justify-content: center
    position: absolute
    top: 1.5rem
    right: 0
    bottom: 0
    width: .4rem
    background: red
    .item
      text-align: center
</style>