我使用Bootstrap 3来构建一个响应式布局，我想根据屏幕大小调整一些字体大小。 我如何使用媒体查询来实现这种逻辑?
当前回答
这些是Bootstrap3的值:
/* Extra Small */
@media(max-width:767px){}
/* Small */
@media(min-width:768px) and (max-width:991px){}
/* Medium */
@media(min-width:992px) and (max-width:1199px){}
/* Large */
@media(min-width:1200px){}
其他回答
这里有两个例子。
一旦视口变成700px宽或更小，使所有h1标签20px。
@media screen and ( max-width: 700px ) {
h1 {
font-size: 20px;
}
}
使所有h1的20px，直到视口达到700px或更大。
@media screen and ( min-width: 700px ) {
h1 {
font-size: 20px;
}
}
希望这能有所帮助:
在我的例子中，你可以看到字体大小和背景颜色根据屏幕大小而变化
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> body { background-color: lightgreen; } /* Custom, iPhone Retina */ @media(max-width:320px){ body { background-color: lime; font-size:14px; } } @media only screen and (min-width : 320px) { body { background-color: red; font-size:18px; } } /* Extra Small Devices, Phones */ @media only screen and (min-width : 480px) { body { background-color: aqua; font-size:24px; } } /* Small Devices, Tablets */ @media only screen and (min-width : 768px) { body { background-color: green; font-size:30px; } } /* Medium Devices, Desktops */ @media only screen and (min-width : 992px) { body { background-color: grey; font-size:34px; } } /* Large Devices, Wide Screens */ @media only screen and (min-width : 1200px) { body { background-color: black; font-size:42px; } } </style> </head> <body> <p>Resize the browser window. When the width of this document is larger than the height, the background-color is "lightblue", otherwise it is "lightgreen".</p> </body> </html>
如果你正在使用LESS或SCSS/SASS，并且你正在使用Bootstrap的LESS/SCSS版本，你也可以使用变量，只要你能访问它们。@full-decent的答案的LESS翻译如下:
@media(max-width: @screen-xs-max){}
@media(min-width: @screen-sm-min){} /* deprecated: @screen-tablet, or @screen-sm */
@media(min-width: @screen-md-min){} /* deprecated: @screen-desktop, or @screen-md */
@media(min-width: @screen-lg-min){} /* deprecated: @screen-lg-desktop, or @screen-lg */
还有@screen-sm-max和@screen-md-max变量，它们分别比@screen-md-min和@screen-lg-min小1个像素，通常用于@media(max-width)。
编辑:如果你使用SCSS/SASS，变量以$开始，而不是@，所以它会是$screen-xs-max等。
或者简单的sas - compass:
@mixin col-xs() {
@media (max-width: 767px) {
@content;
}
}
@mixin col-sm() {
@media (min-width: 768px) and (max-width: 991px) {
@content;
}
}
@mixin col-md() {
@media (min-width: 992px) and (max-width: 1199px) {
@content;
}
}
@mixin col-lg() {
@media (min-width: 1200px) {
@content;
}
}
例子:
#content-box {
@include border-radius(18px);
@include adjust-font-size-to(18pt);
padding:20px;
border:1px solid red;
@include col-xs() {
width: 200px;
float: none;
}
}
这里有一个更简单的一站式解决方案，包括基于媒体查询的独立响应文件。
这允许所有媒体查询逻辑和包含逻辑只存在于一个页面，即加载器。它还允许媒体查询不会使响应式样式表本身混乱。
//loader.less
// this twbs include adds all bs functionality, including added libraries such as elements.less, and our custom variables
@import '/app/Resources/less/bootstrap.less';
/*
* Our base custom twbs overrides
* (phones, xs, i.e. less than 768px, and up)
* no media query needed for this one since this is the default in Bootstrap
* All styles initially go here. When you need a larger screen override, move those
* overrides to one of the responsive files below
*/
@import 'base.less';
/*
* Our responsive overrides based on our breakpoint vars
*/
@import url("sm-min.less") (min-width: @screen-sm-min); //(tablets, 768px and up)
@import url("md-min.less") (min-width: @screen-md-min); //(desktops, 992px and up)
@import url("large-min.less") (min-width: @screen-lg-min); //(large desktops, 1200px and up)
基地。更少的会像这样
/**
* base.less
* bootstrap overrides
* Extra small devices, phones, less than 768px, and up
* No media query since this is the default in Bootstrap
* all master site styles go here
* place any responsive overrides in the perspective responsive sheets themselves
*/
body{
background-color: @fadedblue;
}
sm-min。更少的会像这样
/**
* sm-min.less
* min-width: @screen-sm-min
* Small devices (tablets, 768px and up)
*/
body{
background-color: @fadedgreen;
}
你的索引只需要加载loader。less
<link rel="stylesheet/less" type="text/css" href="loader.less" />
很简单…
