css函数

2024-04-11 07:55:06

css函数主要有：

attr()、calc()、linear-gradient()、radial-gradient()、repeating-linear-gradient()

attr()实例：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<style>
a:after {content: " (" attr(href) ")";}
</style>
</head>

<body>
<p><a href="http://www.runoob.com">菜鸟教程</a></p>
<p><a href="http://www.runoob.com/html/">HTML 教程</a></p>

<p><strong>注意:</strong> IE8 需要声明 !DOCTYPE 才可以支持 attr() 函数。</p>
</body>
</html>

calc()实例：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">  
<style>
#div1 {
    position: absolute;
    left: 50px;
    width: calc(100% - 100px);
    border: 1px solid black;
    background-color: yellow;
    padding: 5px;
    text-align: center;
}
</style>
</head>

<body>
<p>创建一个横跨屏幕的div，div 两边有 50px 的间隙：</p>
<div id="div1">一些文本...</div>
</body>
</html>

linear-gradient()实例：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<style>
/*默认从上到下*/
#grad1 {
    height: 200px;
    background: -webkit-linear-gradient(red,yellow,blue); /* Safari 5.1 to 6.0 */
    background: -o-linear-gradient(red,yellow,blue); /* Opera 11.1 to 12.0 */
    background: -moz-linear-gradient(red,yellow,blue); /* Firefox 3.6 to 15 */
    background: linear-gradient(red,yellow,blue); /* 标准语法 (必须在最后) */
}
/*从左到右*/
#grad2 {
    height: 200px;
    background: -webkit-linear-gradient(left, red , blue); /* Safari 5.1 - 6.0 */
    background: -o-linear-gradient(right, red, blue); /* Opera 11.1 - 12.0 */
    background: -moz-linear-gradient(right, red, blue); /* Firefox 3.6 - 15 */
    background: linear-gradient(to right, red , blue); /* 标准的语法（必须放在最后） */
}
/*从左上角到右下角*/
#grad3 {
    height: 200px;
    background: -webkit-linear-gradient(left top, red , blue); /* Safari 5.1 - 6.0 */
    background: -o-linear-gradient(bottom right, red, blue); /* Opera 11.1 - 12.0 */
    background: -moz-linear-gradient(bottom right, red, blue); /* Firefox 3.6 - 15 */
    background: linear-gradient(to bottom right, red , blue); /* 标准的语法（必须放在最后） */
}
/*指定角度，可以是负数*/
#grad4 {
    height: 100px;
    background: -webkit-linear-gradient(-90deg, red, blue); /* Safari 5.1 - 6.0 */
    background: -o-linear-gradient(-90deg, red, blue); /* Opera 11.1 - 12.0 */
    background: -moz-linear-gradient(-90deg, red, blue); /* Firefox 3.6 - 15 */
    background: linear-gradient(-90deg, red, blue); /* 标准的语法（必须放在最后） */
}
/*多个终止色*/
#grad5 {
    height: 55px;
    background: -webkit-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); /* Safari 5.1 - 6.0 */
    background: -o-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); /* Opera 11.1 - 12.0 */
    background: -moz-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); /* Firefox 3.6 - 15 */
    background: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet); /* 标准的语法（必须放在最后） */
}
/*使用了透明度*/
#grad6 {
    height: 200px;
    background: -webkit-linear-gradient(left, rgba(255,0,0,0), rgba(255,0,0,1)); /* Safari 5.1 - 6.0 */
    background: -o-linear-gradient(right, rgba(255,0,0,0), rgba(255,0,0,1)); /* Opera 11.1 - 12.0 */
    background: -moz-linear-gradient(right, rgba(255,0,0,0), rgba(255,0,0,1)); /* Firefox 3.6 - 15 */
    background: linear-gradient(to right, rgba(255,0,0,0), rgba(255,0,0,1)); /* 标准的语法（必须放在最后） */
}

</style>
</head>

<body>
<h3>线性渐变 - 头部到底部</h3>
<p>从头部开始的线性渐变，从红色开始，转为黄色，再到蓝色:</p>

<div id="grad1"></div>

<p><strong>注意：</strong> Internet Explorer 9 及更早版本 IE 浏览器不支持渐变。</p>
</body>
</html>

radial-gradient()实例：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<style>
/*默认*/
#grad1 {
    height: 150px;
    width: 200px;
    background: -webkit-radial-gradient(red, green, blue); /* Safari 5.1 - 6.0 */
    background: -o-radial-gradient(red, green, blue); /* Opera 11.6 - 12.0 */
    background: -moz-radial-gradient(red, green, blue); /* Firefox 3.6 - 15 */
    background: radial-gradient(red, green, blue); /* 标准的语法（必须放在最后） */
}
/*颜色节点不均匀*/
#grad2 {
  background: -webkit-radial-gradient(red 5%, green 15%, blue 60%); /* Safari 5.1-6.0 */
  background: -o-radial-gradient(red 5%, green 15%, blue 60%); /* Opera 11.6-12.0 */
  background: -moz-radial-gradient(red 5%, green 15%, blue 60%); /* Firefox 3.6-15 */
  background: radial-gradient(red 5%, green 15%, blue 60%); /* 标准语法 */
}
/*原型径向渐变*/
#grad3 {
  background: -webkit-radial-gradient(circle, red, yellow, green); /* Safari */
  background: -o-radial-gradient(circle, red, yellow, green); /* Opera 11.6 to 12.0 */
  background: -moz-radial-gradient(circle, red, yellow, green); /* Firefox 3.6 to 15 */
  background: radial-gradient(circle, red, yellow, green); /* 标准语法 */
}
/*不同尺寸大小关键字的使用*/
#grad4 {
    height: 150px;
    width: 150px;
    background: -webkit-radial-gradient(60% 55%, closest-side,blue,green,yellow,black); /* Safari 5.1 - 6.0 */
    background: -o-radial-gradient(60% 55%, closest-side,blue,green,yellow,black); /* Opera 11.6 - 12.0 */
    background: -moz-radial-gradient(60% 55%, closest-side,blue,green,yellow,black); /* Firefox 3.6 - 15 */
    background: radial-gradient(60% 55%, closest-side,blue,green,yellow,black); /* 标准的语法（必须放在最后） */
}

#grad5 {
    height: 150px;
    width: 150px;
    background: -webkit-radial-gradient(60% 55%, farthest-side,blue,green,yellow,black); /* Safari 5.1 - 6.0 */
    background: -o-radial-gradient(60% 55%, farthest-side,blue,green,yellow,black); /* Opera 11.6 - 12.0 */
    background: -moz-radial-gradient(60% 55%, farthest-side,blue,green,yellow,black); /* Firefox 3.6 - 15 */
    background: radial-gradient(60% 55%, farthest-side,blue,green,yellow,black); /* 标准的语法（必须放在最后） */
}

#grad6 {
    height: 150px;
    width: 150px;
    background: -webkit-radial-gradient(60% 55%, closest-corner,blue,green,yellow,black); /* Safari 5.1 - 6.0 */
    background: -o-radial-gradient(60% 55%, closest-corner,blue,green,yellow,black); /* Opera 11.6 - 12.0 */
    background: -moz-radial-gradient(60% 55%, closest-corner,blue,green,yellow,black); /* Firefox 3.6 - 15 */
    background: radial-gradient(60% 55%, closest-corner,blue,green,yellow,black); /* 标准的语法（必须放在最后） */
}

#grad7 {
    height: 150px;
    width: 150px;
    background: -webkit-radial-gradient(60% 55%, farthest-corner,blue,green,yellow,black); /* Safari 5.1 - 6.0 */
    background: -o-radial-gradient(60% 55%, farthest-corner,blue,green,yellow,black); /* Opera 11.6 - 12.0 */
    background: -moz-radial-gradient(60% 55%, farthest-corner,blue,green,yellow,black); /* Firefox 3.6 - 15 */
    background: radial-gradient(60% 55%, farthest-corner,blue,green,yellow,black); /* 标准的语法（必须放在最后） */
}

</style>
</head>
<body>

<h3>径向渐变 - 颜色结点均匀分布</h3>
<div id="grad1"></div>

<p><strong>注意：</strong> Internet Explorer 9 及之前的版本不支持渐变。</p>

</body>
</html>

repeating-linear-gradient()实例：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<style>
/*默认*/
#grad1 {
    height: 200px;
    background: -webkit-repeating-linear-gradient(red, yellow 10%, green 20%); /* Safari 5.1 - 6.0 */
    background: -o-repeating-linear-gradient(red, yellow 10%, green 20%); /* Opera 11.1 - 12.0 */
    background: -moz-repeating-linear-gradient(red, yellow 10%, green 20%); /* Firefox 3.6 - 15 */
    background: repeating-linear-gradient(red, yellow 10%, green 20%); /* 标准的语法（必须放在最后） */
}
/*不同的重复线性渐变*/
#grad2 {
    height: 200px;
    background: -webkit-repeating-linear-gradient(45deg,red,blue 7%,green 10%); /* For Safari 5.1 to 6.0 */
    background: -o-repeating-linear-gradient(45deg,red,blue 7%,green 10%); /* For Opera 11.1 to 12.0 */
    background: -moz-repeating-linear-gradient(45deg,red,blue 7%,green 10%); /* For Firefox 3.6 to 15 */
    background: repeating-linear-gradient(45deg,red,blue 7%,green 10%); /* 标准语法 (必须在最后) */
}
 
#grad3 {
    height: 200px;
    background: -webkit-repeating-linear-gradient(190deg,red,blue 7%,green 10%); /* For Safari 5.1 to 6.0 */
    background: -o-repeating-linear-gradient(190deg,red,blue 7%,green 10%); /* For Opera 11.1 to 12.0 */
    background: -moz-repeating-linear-gradient(190deg,red,blue 7%,green 10%); /* For Firefox 3.6 to 15 */
    background: repeating-linear-gradient(190deg,red,blue 7%,green 10%); /* 标准语法 (必须在最后) */
}
 
#grad4 {
    height: 200px;
    background: -webkit-repeating-linear-gradient(90deg,red,blue 7%,green 10%); /* For Safari 5.1 to 6.0 */
    background: -o-repeating-linear-gradient(); /* For Opera 11.1 to 12.0 */
    background: -moz-repeating-linear-gradient(90deg,red,blue 7%,green 10%); /* For Firefox 3.6 to 15 */
    background: repeating-linear-gradient(90deg,red,blue 7%,green 10%); /* 标准语法 (必须在最后) */
}

</style>
</head>
<body>

<h3>重复的线性渐变</h3>

<div id="grad1"></div>

<p><strong>注意：</strong> Internet Explorer 9 及之前的版本不支持渐变。</p>

</body>
</html>

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