<button (click)="toggle($event)">隐藏/显示</button>

/**
 * Adds an event listener to the current node.
 *
 * If an output exists on one of the node's directives, it also subscribes to the output
 * and saves the subscription for later cleanup.
 *
 * \@codeGenApi
 * @param {?} eventName Name of the event
 * @param {?} listenerFn The function to be called when event emits
 * @param {?=} useCapture Whether or not to use capture in event listener
 * @param {?=} eventTargetResolver Function that returns global target information in case this listener
 * should be attached to a global object like window, document or body
 *
 * @return {?}
 */
function ɵɵlistener(eventName, listenerFn, useCapture = false, eventTargetResolver) {
    /** @type {?} */
    const lView = getLView();
    /** @type {?} */
    const tView = getTView();
    /** @type {?} */
    const tNode = getPreviousOrParentTNode();
    listenerInternal(tView, lView, lView[RENDERER], tNode, eventName, listenerFn, useCapture, eventTargetResolver);
    return ɵɵlistener;
}