Function toggleClass

component/util/dom.js:1–9

(el, className)

export function toggleClass(el, className){
    if (el && el instanceof Node && className) {
        let str = el.className;
        const index = str.indexOf(className);
        el.className = index === -1 ? 
            `${str} ${className}` 
            : str.slice(0, index) + str.slice(index, className.length);
    }
}

export function removeClass(el, className){
    if (!el || !className) return;