H5 CSS3 渐变的使用
CSS3 渐变(gradients)可以让你在两个或多个指定的颜色之间显示平稳的过渡。
以前,你必须使用图像来实现这些效果。但是,通过使用 CSS3 渐变(gradients),你可以减少下载的事件和宽带的使用。此外,渐变效果的元素在放大时看起来效果更好,因为渐变(gradient)是由浏览器生成的。
CSS3 定义了两种类型的渐变(gradients):
线性渐变(Linear Gradients)- 向下/向上/向左/向右/对角方向
径向渐变(Radial Gradients)- 由它们的中心定义
<!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="UTF-8"> <title>从上到下的线性渐变</title> <style> .grad{ background: -webkit-linear-gradient(red, blue); /* Safari 5.1 - 6.0 */ background: -o-linear-gradient(red, blue); /* Opera 11.1 - 12.0 */ background: -moz-linear-gradient(red, blue); /* Firefox 3.6 - 15 */ background: linear-gradient(red, blue); /* 标准的语法(必须放在最后) */ } </style> </head> <body> <div class="grad" style="height: 200px;"></div> </body> </html>
效果图:
<!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="UTF-8"> <title>一个带有彩虹颜色和文本的线性渐变</title> <style> .grad{ 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) */ } </style> </head> <body> <div class="grad" style="height: 200px;"></div> </body> </html>
效果图:
<!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="UTF-8"> <title>使用透明度</title> <style> .grad{ 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> <div class="grad" style="height: 200px;"></div> </body> </html>
效果图:
<!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="UTF-8"> <title>径向渐变</title> <style> .grad{ background: -webkit-radial-gradient(circle, red, yellow, green); /* Safari 5.1 - 6.0 */ background: -o-radial-gradient(circle, red, yellow, green); /* Opera 11.6 - 12.0 */ background: -moz-radial-gradient(circle, red, yellow, green); /* Firefox 3.6 - 15 */ background: radial-gradient(circle, red, yellow, green); /* 标准的语法(必须放在最后) */ } </style> </head> <body> <div class="grad" style="height: 200px; width: 300px;"></div> </body> </html>
效果图:
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