[英]Cannot read property 'style' of undefined in Javascript Function
我有這個 Javascript 函數,但是當我運行它時,它說“無法讀取 showSlides 上未定義的屬性‘樣式’”
var slideIndex = 1;
showSlides(slideIndex);
// Next/previous controls
function plusSlides(n) {
showSlides(slideIndex += n);
}
// Thumbnail image controls
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";
}
if (n < 1) {slideIndex = slides.length - 1}
slideIndex
不能是slides.length
, slides
的最后一個元素將出現在slides.length - 1
,而不是slides.length
。
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