Function toggleClass

lib/util/dom.js:11–17

(el, className)

exports.addClass = addClass;
exports.getClassList = getClassList;
function toggleClass(el, className) {
    if (el && el instanceof Node && className) {
        var str = el.className;
        var index = str.indexOf(className);
        el.className = index === -1 ? str + ' ' + className : str.slice(0, index) + str.slice(index, className.length);
    }
}

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