问题
I somehow have to programmatically set the width of the :before for a div.
<div className="something" style={someStyle}> </div>
How can I define the someStyle so that the width of the :before of .something``div can change accordingly??
回答1:
Pseudo elements cannot be styled with inline styles as explained in https://stackoverflow.com/a/14141821/368697. You will have to style the something class name in a stylesheet with the .something:before selector. This is not a limitation of React but rather a design choice for HTML + CSS.
If you need to programmatically change the width of the pseudo :before element, it is probably more appropriate as a regular DOM element rendered by React.
来源：https://stackoverflow.com/questions/26070450/can-reactjs-programmatically-handle-before