如何最有效地检查某些“断点”在浏览器重新调整大小? [英] How to most efficiently check for certain "breakpoints" upon browser re-size?
问题描述
我正在使用一些定义了两个断点的响应式设计:
I'm playing with some responsive design that have two breakpoints defined:
Mobile > max-width 320px
Tablet portrait > max-width 767px
在桌面上我有很多动画+高级功能正在使用Javascript。在移动设备和平板电脑上,我希望简化和禁用一些JS +重建一些DOM元素。
On desktop I have a lot of animation + advanced functionality going on with Javascript. On mobile and tablet im looking to simplify and disable both some JS + "re-building" some DOM elements.
我想知道最有效的确定方法是什么某些断点(宽度方面)会是什么?我在这里考虑了很多性能。
我知道我可以通过以下方式检查窗口宽度:
I know I can simply check for the window width upon re-size with something like:
$( window ).resize(function() {
if ($(window).width() > 320 && $(window).width() < 400) {
//mobile
}
if ($(window).width() > 401 && $(window).width() < 768) {
//tablet
}
if ($(window).width() > 769) {
//desktop
}
});
但这似乎是一个非常昂贵的操作?
But that seems like a very "expensive" operation?
对于可用于此的轻量级库的任何建议也非常受欢迎!
Any suggestions to lightweight libraries that can be used for this is also very welcome!
推荐答案
我经常遇到这个问题并没有找到完美的解决方案。但是,有一种解决方法似乎不那么耗费资源。通过在 resize()
函数中使用超时并不断清除它,您可以确保只在视口停止调整大小时才运行代码。
I often ran into this problem and have not found the perfect solution. However, there is a workaround that seems less resource hungry. By using a timeout inside your resize()
function and constantly clearing it, you can make sure that your code is only run, once the viewport has stopped resizing.
var resizeTimer, width;
var mobile = tablet = desktop = false;
$(window).resize(function() {
// clear the timeout
clearTimeout(resizeTimer);
// execute breakpointChange() once the viewport
// has stopped changing in size for 400ms
resizeTimer = setTimeout(breakpointChange(), 400);
});
function breakpointChange() {
// use vanillajs window.innerWidth
// instead of jQuery $(window).width() as suggested by simon
width = window.innerWidth;
if (!mobile && width < 400) {
tablet = desktop = false;
mobile = true;
console.log('is mobile');
}
if (!tablet && width > 401 && width < 768) {
mobile = desktop = false;
tablet = true;
console.log('is tablet');
}
if (!desktop && width > 769) {
mobile = tablet = false;
desktop = true;
console.log('is desktop');
}
}
$(window).resize();
这肯定不是最好的,但它会阻止你的代码经常运行。随意添加到我的答案和/或纠正我。这是一个小提琴
This is certainly not the best one can do, but it will prevent that your code is constantly being run. Feel free to add to my answer and/or correct me. Here is a fiddle
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