RGBA非常有趣,而-webkit-gradient
、-moz-gradient
和progid:DXImageTransform.Microsoft.gradient
也很有趣...是的。:)
是否有一种方法可以结合当前/最新的CSS规范使用RGBA和渐变,以便产生alpha透明度渐变。
是的。您可以在webkit和moz梯度声明中使用rgba:
/* webkit example */
background-image: -webkit-gradient(
linear, left top, left bottom, from(rgba(50,50,50,0.8)),
to(rgba(80,80,80,0.2)), color-stop(.5,#333333)
);
(src)
(注意:保留了HTML格式)/* mozilla example - FF3.6+ */
background-image: -moz-linear-gradient(
rgba(255, 255, 255, 0.7) 0%, rgba(255, 255, 255, 0) 95%
);
(src)
显然,即使在IE中也可以使用奇怪的“扩展十六进制”语法来实现这一点。示例中的第一对数(55)是指不透明度的级别:
/* approximately a 33% opacity on blue */
filter: progid:DXImageTransform.Microsoft.gradient(
startColorstr=#550000FF, endColorstr=#550000FF
);
/* IE8 uses -ms-filter for whatever reason... */
-ms-filter: progid:DXImageTransform.Microsoft.gradient(
startColorstr=#550000FF, endColorstr=#550000FF
);
(src)
(保留HTML)background-image: -o-linear-gradient(top,rgba(255,255,255,0),rgba(210, 230, 250,1));
- WhoSayInfilter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#550000FF, endColorstr=#550000FF)";
- user2567536新语法已经被所有现代浏览器支持一段时间了(从Chrome 26,Opera 12.1,IE 10和Firefox 16开始):http://caniuse.com/#feat=css-gradients
background: linear-gradient(to bottom, rgba(0, 0, 0, 1), rgba(0, 0, 0, 0));
这会呈现出一个渐变效果,从顶部的纯黑色渐变到底部完全透明。
这是一些非常酷的东西!我需要基本相同的功能,但希望它是从白色到透明的水平渐变。现在完全能够正常工作了!这是我的代码:
.gradient{
/* webkit example */
background-image: -webkit-gradient(
linear, right top, left top, from(rgba(255, 255, 255, 1.0)),
to(rgba(255, 255, 255, 0))
);
/* mozilla example - FF3.6+ */
background-image: -moz-linear-gradient(
right center,
rgba(255, 255, 255, 1.0) 20%, rgba(255, 255, 255, 0) 95%
);
/* IE 5.5 - 7 */
filter: progid:DXImageTransform.Microsoft.gradient(
gradientType=1, startColor=0, endColorStr=#FFFFFF
);
/* IE8 uses -ms-filter for whatever reason... */
-ms-filter: progid:DXImageTransform.Microsoft.gradient(
gradientType=1, startColor=0, endColoStr=#FFFFFF
);
}
这是我的代码:
background: #e8e3e3; /* Old browsers */
background: -moz-linear-gradient(top, rgba(232, 227, 227, 0.95) 0%, rgba(246, 242, 242, 0.95) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(232, 227, 227, 0.95)), color-stop(100%,rgba(246, 242, 242, 0.95))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* IE10+ */
background: linear-gradient(to bottom, rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='rgba(232, 227, 227, 0.95)', endColorstr='rgba(246, 242, 242, 0.95)',GradientType=0 ); /* IE6-9 */
#grad
{
background: -webkit-linear-gradient(left,rgba(255,0,0,0),rgba(255,0,0,1)); /*Safari 5.1-6*/
background: -o-linear-gradient(right,rgba(255,0,0,0),rgba(255,0,0,1)); /*Opera 11.1-12*/
background: -moz-linear-gradient(right,rgba(255,0,0,0),rgba(255,0,0,1)); /*Fx 3.6-15*/
background: linear-gradient(to right, rgba(255,0,0,0), rgba(255,0,0,1)); /*Standard*/
}
background: linear-gradient(to bottom, rgba(0, 64, 122, 1) 0%,rgba(0, 64, 122, 0.8) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
background: -o-linear-gradient(top, rgba(0, 64, 122, 1) 0%, rgba(0, 64, 122, 0.8) 100%); /* Opera 11.10+ */
background: -moz-linear-gradient(top, rgba(0, 64, 122, 1) 0%, rgba(0, 64, 122, 0.8) 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, rgba(0, 64, 122, 1) 0%,rgba(0, 64, 122, 0.8) 100%); /* Chrome10-25,Safari5.1-6 */
background: -ms-linear-gradient(top, rgba(0, 64, 122, 1) 0%,rgba(0, 64, 122, 0.8) 100%); /* IE10+ */
-ms-filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00407a', endColorstr='#cc00407a',GradientType=0 ); /* IE8 */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00407a', endColorstr='#cc00407a',GradientType=0 ); /* IE 5.5 - 9 */
我刚刚发现了这个更近期的例子。为了简化并使用最新的示例,将CSS选择器类命名为“grad”(我已包含向后兼容性)。
.grad {
background-color: #F07575; /* fallback color if gradients are not supported */
background-image: -webkit-linear-gradient(top left, red, rgba(255,0,0,0));/* For Chrome 25 and Safari 6, iOS 6.1, Android 4.3 */
background-image: -moz-linear-gradient(top left, red, rgba(255,0,0,0));/* For Firefox (3.6 to 15) */
background-image: -o-linear-gradient(top left, red, rgba(255,0,0,0));/* For old Opera (11.1 to 12.0) */
background-image: linear-gradient(to bottom right, red, rgba(255,0,0,0)); /* Standard syntax; must be last */
}
from https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient