Access CSS variable from javascript [duplicate]

问题

This question already has an answer here:

• Accessing a CSS custom property (aka CSS variable) through JavaScript 3 answers

Is there a way to access a css variable from javascript? Here my css variable declaration.

:root{
    --color-font-general:#336699;
}

回答1:

Just the standard way:

1. Get the computed styles with getComputedStyle
2. Use getPropertyValue to get the value of the desired property

getComputedStyle(element).getPropertyValue('--color-font-general');

Example:

var style = getComputedStyle(document.body);
console.log(style.getPropertyValue('--color-font-general'));

:root { --color-font-general: #336699; }

回答2:

Use this:

window.getComputedStyle(document.documentElement).getPropertyValue('--color-font-general');

And you can change it like this:

document.documentElement.style.setProperty('--color-font-general', '#000');

source

来源：https://stackoverflow.com/questions/41725725/access-css-variable-from-javascript