我在标题中有一个事件监听器:
window.onkeydown = function(e) {
    var key = e.keyCode ? e.keyCode : e.which;
    if(key == 27) {
        var panel = document.getElementById('largeImgPanel');
    hideMe(panel);
    }
    if(key == 39) {
        arrow_right.onclick = onRight; //Wrong
    }
};
下我有一个功能:
window.onload = function() {
           ...
    var onRight = function showNext(img_thumb) {
    index = index + 1;
    document.getElementById('largeImg').src = arr_big[index].src;
    showLargeImagePanel();
    unselectAll();
};
arrow_right.onclick = onRight;
我的问题是:如何从事件侦听器“执行” onRight 变量?