如何使用addEventListener在数组内部导航？

Question

我正在尝试为项目设置滑块。我有一个对象数组，每个对象都包含一个图像和一个图例。每次用户单击下一个或上一个按钮时，它应显示数组的下一个或上一个对象。问题在于它显示的是同一张图片，而不是下一张，第三张，第五张等。

var index = 0;
var images = [
    {image: 'images/1.jpg', legend: 'Street Art'},
    {image: 'images/2.jpg', legend: 'Fast Lane'},
    {image: 'images/3.jpg', legend: 'Colorful Building'},
    {image: 'images/4.jpg', legend: 'Skyscrapers'},
    {image: 'images/5.jpg', legend: 'City by night'},
    {image: 'images/6.jpg', legend: 'Tour Eiffel la nuit'}
];
var previous = document.getElementById('slider-previous');
var next = document.getElementById('slider-next');

next.addEventListener('click', function() {
    img.src= images[index++].image;
    figcaption.textContent = images[index++].legend;
});
previous.addEventListener('click', function() {
    img.src= images[index--].image;
    figcaption.textContent = images[index--].legend;
});

Answer 1

效果更好，谢谢菲尔

next.addEventListener('click', function() {
    ++index;
    img.src= images[index].image;
    figcaption.textContent = images[index].legend;
});

previous.addEventListener('click', function() {
    --index;
    img.src= images[index].image;
    figcaption.textContent = images[index].legend;
});