fineui/src/core/element/plugins/css.js

import { isNull, isObject, each, trim, camelize } from "../../2.base";

export const registCssFun = Element => {
    Element.registerFunction("css", function (key, value) {
        if (isObject(key)) {
            each(key, (k, v) => {
                this.css(k, v);
            });
            
            return this;
        }
        key = trim(camelize(key));
        
        return css(this, key, value);
    });
};

const css = (elem, key, value) => {
    key = trim(camelize(key));
    if (isNull(value)) {
        return elem.styles[key];
    }
    elem.styles[key] = value;
    
    return elem;
};