使用css方式
html代码
<h2>响应式判断</h2>
<p class="example">操作浏览器窗口，查看效果。</p>
css样式代码
.example {
padding: 20px;
color: white;
}
/* Extra small devices (phones, 600px and down) */
@media only screen and (max-width: 600px) {
.example {background: red;}
}
/* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 600px) {
.example {background: green;}
}
/* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {
.example {background: blue;}
}
/* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {
.example {background: orange;}
}
/* Extra large devices (large laptops and desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {
.example {background: pink;}
}
实现屏幕（窗口）不同大小，<p>标签显示不同的背景色； css语法:(css有很多媒体类型)
@media mediatype and|not|only (media feature) {
CSS-Code;
}
使用javascript方式
html代码
<body class='sidebar-collapse'></body>
js代码
<script>
//dom加载完后执行:$(function() {}) 是$(document).ready(function()的简写
$(function () {
changeClass();
});
//浏览器的窗口大小发生改变时执行
$(window).resize(function () {
//执行代码块
changeClass();
});
//当屏幕小于1400时添加一个属性，大于的时候删除属性
function changeClass() {
let ww = $(window).width();
if( ww > 1400 ){
$('body').removeClass('sidebar-collapse');
} else if( ww > 600 && ww < 1400 ){
$('body').addClass('sidebar-collapse');
}
}
</script>
