amis/examples/polyfills/cloest.ts

/**
 * @file 担心会有些浏览器不支持，所以网上抄了一段
 * @author mdn
 */
if (!Element.prototype.matches) {
    Element.prototype.matches = Element.prototype.msMatchesSelector
    || Element.prototype.webkitMatchesSelector;
}

if (!Element.prototype.closest) {
    Element.prototype.closest = function (s) {
        var el = this;
        if (!document.documentElement.contains(el)) {
            return null;
        }

        do {
            if (el.matches(s)) {
                return el;
            }
            el = el.parentElement;
        } while (el !== null);
        return null;
    };
}