我幻灯片播放工作,我按箭头但加载时会出现此错误
未捕获的TypeError:无法读取未定义的属性“样式” 在showSlides(gallery.js:24) 在gallery.js:2
这是我的代码 的Javascript
var slideIndex = 1;
showSlides(slideIndex);
function plusSlides(n) {
showSlides(slideIndex += n);
}
function currentSlide(n) {
showSlides(slideIndex = n);
}
function showSlides(n) {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
if (n > slides.length) {
slideIndex = 1
}
if (n < 1) {
slideIndex = slides.length
}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
}
答案 0 :(得分:0)
很可能是因为元素slides[slideIndex-1]
不存在,可能是因为document.getElementsByClassName("mySlides")
返回undefined
或slideIndex-1 < 0