javascript - Bootstrap 网站标题中使用的图像类型

Question

只需转到以下链接：

http://twitter.github.io/bootstrap/

查看页面顶部的大背景图像。（它是蓝色和紫色）​​。我查看了该页面的源代码。但我找不到该背景的任何图像文件。所以我很好奇。

任何帮助？

Answer 1

他们使用 css3 渐变和带有 :after psedo calss 的 png 图像的组合。

查看类 css

.jumbotron {
    position: relative;
    padding: 40px 0;
    color: #fff;
    text-align: center;
    text-shadow: 0 1px 3px rgba(0,0,0,.4), 0 0 30px rgba(0,0,0,.075);
    background: #020031;
    background: -moz-linear-gradient(45deg, #020031 0%, #6d3353 100%);
    background: -webkit-gradient(linear, left bottom, right top, color-stop(0%,#020031), color-stop(100%,#6d3353));
    background: -webkit-linear-gradient(45deg, #020031 0%,#6d3353 100%);
    background: -o-linear-gradient(45deg, #020031 0%,#6d3353 100%);
    background: -ms-linear-gradient(45deg, #020031 0%,#6d3353 100%);
    background: linear-gradient(45deg, #020031 0%,#6d3353 100%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#020031', endColorstr='#6d3353',GradientType=1 );
    -webkit-box-shadow: inset 0 3px 7px rgba(0,0,0,.2), inset 0 -3px 7px rgba(0,0,0,.2);
    -moz-box-shadow: inset 0 3px 7px rgba(0,0,0,.2), inset 0 -3px 7px rgba(0,0,0,.2);
    box-shadow: inset 0 3px 7px rgba(0,0,0,.2), inset 0 -3px 7px rgba(0,0,0,.2);
}


.jumbotron:after {
    content: '';
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: url(../img/bs-docs-masthead-pattern.png) repeat center center;
    opacity: .4;
}

Answer 2

试试这个演示

ColorZilla是创建cross-browser兼容渐变的绝佳工具。

.test{
    background: #020031;
    background: -moz-linear-gradient(45deg, #020031 0%, #6d3353 100%);
    background: -webkit-gradient(linear, left bottom, right top, color-stop(0%,#020031), color-stop(100%,#6d3353));
    background: -webkit-linear-gradient(45deg, #020031 0%,#6d3353 100%);
    background: -o-linear-gradient(45deg, #020031 0%,#6d3353 100%);
    background: -ms-linear-gradient(45deg, #020031 0%,#6d3353 100%);
    background: linear-gradient(45deg, #020031 0%,#6d3353 100%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#020031', endColorstr='#6d3353',GradientType=1 );

    height: 400px;
    width:100%;
}
.test:after {
    content: '';
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: url(http://twitter.github.io/bootstrap/assets/img/bs-docs-masthead-pattern.png) repeat center center;
    opacity: .4;
}