CSS3 渐变

div{
    width: 200px;
    height: 200px;
    background-image:repeating-linear-gradient(to right, red 10%, green 20%);
}

渐变分为线性渐变和径向渐变两种；其中：线性渐变指的是从上/下/左/右/对角方向开始的渐变，径向渐变指的是从模块的中心到周边开始的渐变。

　　线性渐变：

1. 从上至下线性渐变

   div{
       width: 200px;
       height: 200px;
       background-image:linear-gradient(#e66465, #9198e5);
   }

2. 从左至右线性渐变

   div{
       width: 200px;
       height: 200px;
       background-image:linear-gradient(to right, red, yellow);
   }

3. 对角线性渐变

   div{
       width: 200px;
       height: 200px;
       background-image:linear-gradient(to right bottom, red, green);
   }

4. 使用角度的线性渐变

   div{
       width: 200px;
       height: 200px;
       background-image:linear-gradient(-90deg, red,yellow);
   }

5. 使用多个颜色节点的线性渐变

   div{
       width: 600px;
       height: 100px;
       background-image: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet);
   }

6. 使用透明度的线性渐变

   div{
       width: 200px;
       height: 200px;
       background-image: linear-gradient(to right, rgba(255,0,0,0), rgba(255,0,0,1));
   }

7. 重复的线性渐变

   div{
       width: 200px;
       height: 200px;
       background-image:repeating-linear-gradient(to right, red 10%, green 20%);
   }

　　径向渐变：

1. 颜色节点均匀分布（默认情况下）

   div{
       width: 200px;
       height: 100px;
       background-image:radial-gradient(red, yellow,green);
   }

2. 颜色节点不均匀分布

   div{
       width: 200px;
       height: 100px;
       background-image: radial-gradient(red 5%, yellow 15%, green 60%);
   }

3. 设置形状——circle

   div{
       display: inline-block;
       width: 200px;
       height: 100px;
       background-image: radial-gradient(circle,red,yellow,green);
   }

4. 设置形状——ellipse

   div{
       display: inline-block;
       width: 200px;
       height: 100px;
       background-image: radial-gradient(ellipse,red,yellow,green);
   }

5. 重复的径向渐变

   div{
       width: 200px;
       height: 200px;
       background-image:repeating-radial-gradient(red, yellow 10%, green 15%);
   }

6. 不同尺寸大小关键字的使用

   .one{
       width: 100px;
       height: 100px;
       background-image:radial-gradient(closest-side at 60% 55%, red, yellow, black);
   }

   .two{
       width: 100px;
       height: 100px;
       background-image:radial-gradient(farthest-side at 60% 55%, red, yellow, black);
   }

   .three{
       width: 100px;
       height: 100px;
       background-image:radial-gradient(closest-corner at 60% 55%, red, yellow, black);
   }

   .four{
       width: 100px;
       height: 100px;
       background-image:radial-gradient(farthest-corner at 60% 55%, red, yellow, black);
   }

 注：本文仅供理解，重点在于熟练使用