我使用Bootstrap 4,所以我在页面上添加了以下HTML代码
HTML
<div id="device-size-detector">
<div id="xs" class="d-block d-sm-none"></div>
<div id="sm" class="d-none d-sm-block d-md-none"></div>
<div id="md" class="d-none d-md-block d-lg-none"></div>
<div id="lg" class="d-none d-lg-block d-xl-none"></div>
<div id="xl" class="d-none d-xl-block"></div>
</div>
JS
$(document).ready(function() {
"use strict"
function getBootstrapDeviceSize() {
return $('#device-size-detector').find('div:visible').first().attr('id');
}
function checkMenu(){
var screen = getBootstrapDeviceSize();
$(window).on('resize', function() {
screen = getBootstrapDeviceSize();
});
if(screen == "lg" || screen == "xl") {
console.log(1);
} else {
console.log(0);
}
}
checkMenu();
});
但是我的脚本只检测屏幕大小的第一个值,并且在调整大小时没有检测到宽度的任何变化。我想我没有正确使用$(window).on('resize', function() {...}
,但我不明白如何修复它并让它工作?
答案 0 :(得分:3)
将window.resize
代码移到checkMenu
函数之外,并调用以下函数。
$(window).on('resize', checkMenu);
$(document).ready(function() {
"use strict"
function getBootstrapDeviceSize() {
return $('#device-size-detector').find('div:visible').first().attr('id');
}
function checkMenu(){
var screen = getBootstrapDeviceSize();
if(screen == "lg" || screen == "xl") {
console.log(1);
} else {
console.log(0);
}
}
checkMenu();
$(window).on('resize', checkMenu);
});
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="device-size-detector">
<div id="xs" class="d-block d-sm-none"></div>
<div id="sm" class="d-none d-sm-block d-md-none"></div>
<div id="md" class="d-none d-md-block d-lg-none"></div>
<div id="lg" class="d-none d-lg-block d-xl-none"></div>
<div id="xl" class="d-none d-xl-block"></div>
</div>
&#13;