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我想要创建tabindex的元素,并通过按键向上导航我想获得该元素的索引,传递给计数器并将下一个元素设置为活动。问题是我无法获得所关注元素的索引。代码:空间导航
var focusable = Array.from(document.querySelectorAll('[tabindex]'));
focusable[1].focus()
window.addEventListener('keydown', function(e) {
var counter;
if (e.keyCode == '38') {
//here i want to pass the index of elment
//from array which is focused and pass it to counter
console.log('up');
counter++
console.log(counter)
focusable[counter].focus()
}
});