function disableTocAnimation(event) {
        var target = event.target || event.srcElement
        if (typeof target.className !== 'string' || target.className.indexOf(options.linkClass) === -1) {
            return
        }
        // Bind to tocLink clicks to temporarily disable highlighting
        // while smoothScroll is animating.
        currentlyHighlighting = false
    }
Disable TOC Animation when a link is clicked.
@param {Event} event