css3

css3

原創

fechild

2020-02-20 13:51

css3新添加的常用的特性有哪些？

1.邊框：border-radius、box-shadow、border-image

2.背景：背景漸變、background-image、background-size、background-origin、background-clip

3.2D轉換：transform，取值：translate、scale、screw、rotate、matrix合併前面幾項位移，3D轉換，即在前面幾個加 3d

4.動畫：transition、animation

5.彈性盒子：flex box

一、css3新特性

1.position新增：sticky，表現爲吸頂，當元素在視野範圍內時，與position:relative，表現相同，當元素不在視野範圍內時，與position：fixed表現相同。但是需要注意的一點是：sticky屬性必須與top、left、bottom、right任意之一結合纔可以生效。例子：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>postion-sticky</title>
  <style>
    .title {
      position: sticky;
      height: 30px;
      width: 100%;
      background: red;
      top: 0;
    }
    .content {
      height: 200px;
      background: blue;
    }
    .content:nth-child(even) {
      background: orange;
    }
  </style>
</head>

<body>
  <div class="title"></div>
  <div class="content"></div>
  <div class="content"></div>
  <div class="content"></div>
  <div class="content"></div>
</body>

</html>

2.flex彈性佈局

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>display-flex || inline-flex</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    .flex {
      display: flex;
      border: 1px solid red;
      background-color: grey;
      flex-direction: column;
    }
    .item {
      padding: 5px 10px;
      background-color: white;
      flex: auto;
    }
    .content-wrap {
      display: flex;
      flex-direction: row;
      padding: 0;
    }
    .header,.footer{
      background: red;
    }
    .side {
      flex: 1;
      background: blue;
    }
    .content {
      flex: 3;
      display: flex;
      flex-direction: column;
    }
    .content1 {
      flex: 1;
      background: grey;
    }
    .content2 {
      flex: 1;
      background: pink;
    }
    .content3 {
      flex: 1;
      background: orange;
    }
  </style>
</head>
<body>
  <div class="flex">
    <div class="item header">header</div>
    <div class="item content-wrap">
      <div class="side">side</div>
      <div class="content">
        <div class="content1">
          content1<br>content1<br>content1<br>content1<br>content1<br>content1<br>
        </div>
        <div class="content2">content2<br>content2<br>content2<br>content2<br>content2<br></div>
        <div class="content3">content3<br>content3<br>content3<br>content3<br>content3<br>content3<br>content3<br>content3<br>content3<br></div>
      </div>
    </div>
    <div class="item footer">footer</div>
  </div>
</body>
</html>

結果：