export function hasClass(node, className) {
    if (node.classList) {
        return node.classList.contains(className);
    }
    const originClass = node.className;
    return originClass.indexOf(className) > -1;
}

export function addClass(node, className) {
    if (node.classList) {
        node.classList.add(className);
    } else {
        if (!hasClass(node, className)) {
            node.className = `${node.className} ${className}`;
        }
    }
}

export function removeClass(node, className) {
    if (node.classList) {
        node.classList.remove(className);
    } else {
        if (hasClass(node, className)) {
            const originClass = node.className;
            node.className = originClass.replace(className, '');
        }
    }
}