如何在 JavaScript 中将 px 转换为 vw?
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How can I convert px to vw in JavaScript?
提问by Kappys
I want to convert pxto vwin JavaScript, how can I do it?
我想在 JavaScript 中转换px为vw,我该怎么做?
I've been looking for it, but I haven't found anything.
我一直在寻找它,但我什么也没找到。
So,
所以,
1px → ? vw
1px → ? 大众
Thanks.
谢谢。
回答by Fabrizio Calderan
1px = (100vw / [document.documentElement.clientWidth] px)
1px = (100vw / [document.documentElement.clientWidth] px)
e.g. — If your viewport was 500pxwide (equals by definition to 100vw) then
例如——如果你的视口很500px宽(根据定义等于100vw)那么
1px = (100vw / 500px) = 0.2vw
1px = (100vw / 500px) = 0.2vw
I used .clientWidthto exclude any scrollbarfrom computation
我曾经.clientWidth以排除任何滚动条的计算
回答by enguerranws
As 1vw / 1vh represents 1/100th of the viewport width / height, you could achieve this using something like :
由于 1vw / 1vh 代表视口宽度/高度的 1/100,您可以使用以下方法实现:
var newWidth = yourElement.outerwidth / document.documentElement.clientWidth *100;
yourElement.style.width = newWidth +'vw';
I thought about use a Math.round() to get clean number, but you'll surely get wrong dimensions if you exclude decimals.
我想过使用 Math.round() 来获得干净的数字,但是如果排除小数,您肯定会得到错误的尺寸。
Can't you change this values directly in CSS (e.g. with another stylesheet) ? It seems really dirty to convert it via Javascript.
您不能直接在 CSS 中更改此值(例如,使用另一个样式表)吗?通过 Javascript 转换它似乎很脏。
Also, according to Errand's comment, if you simply convert your px to vw/vh, it won't make your current HTML/CSS magically fit in the screen.
此外,根据 Errand 的评论,如果您只是将 px 转换为 vw/vh,它不会使您当前的 HTML/CSS 神奇地适合屏幕。

