我想在js中创建一个全屏图像滑块,所以我看了一个教程,并且我理解了大部分“计数器”旁边的内容。我知道它代表了当前图像,但我不知道它是怎么做的,如何被分配。
代码在这里
let sliderImages = document.querySelectorAll(".slide"),
arrowLeft = document.querySelector("#arrow-left"),
arrowRight = document.querySelector("#arrow-right"),
current = 0; (!!!!THIS ONE I DON`T UNDERSTAND HOW IT S REPRESENTING THE CURRENT IMAGE!!!
// Clear all images
function reset() {
for (let i = 0; i < sliderImages.length; i++) {
sliderImages[i].style.display = "none";
}
}
// Init slider
function startSlide() {
reset();
sliderImages[0].style.display = "block";
}
// Show prev
function slideLeft() {
reset();
sliderImages[current - 1].style.display = "block";
current--;
}
// Left arrow click
arrowLeft.addEventListener("click", function () {
if (current === 0) {
current = sliderImages.length;
}
slideLeft();
});
// Show next
function slideRight() {
reset();
sliderImages[current + 1].style.display = "block";
current++;
}
// Right arrow click
arrowRight.addEventListener("click", function () {
if (current === sliderImages.length - 1) {
current = -1;
}
slideRight();
});
startSlide();
!这是补习https://youtu.be/7ZO2RTMNSAY的链接
答案 0 :(得分:1)
当前用于包含所有带有滑动类名称的元素的数组的索引。
阅读有关数组的更多信息可能对您有益:https://www.w3schools.com/js/js_arrays.asp