我想用下一个和上一个按钮创建 javascript slider 。 现在下一个和上一个按钮工作正常。但我需要自动滑动
<link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css">
<body>
<h2 class="slide">Manual Slideshow</h2>
<div class="innerArea" style="max-width:800px;position:relative">
<div class="SlidePic">
<img class="" src="img_fjords.jpg" style="">
<p>Hello</p>
</div>
<div class="SlidePic">
<img src="image/oracle.png">
<p>Hello1</p>
</div>
<div class="SlidePic">
<img src="image/oracle.png">
<p>Hello2</p>
</div>
<div class="SlidePic">
<img src="img_forest.jpg">
<p>Hello3</p>
</div>
<a class="w3-btn-floating" style="position:absolute;top:45%;left:0" onclick="plusDivs(-1)">></a>
<a class="w3-btn-floating" style="position:absolute;top:45%;right:0" onclick="plusDivs(1)">
<</a>
</div>
</body>
<script>
var slideIndex = 1;
showDivs(slideIndex);
function plusDivs(n) {
showDivs(slideIndex += n);
}
function showDivs(n) {
if(n=='')
n=1;
var i;
var x = document.getElementsByClassName("mySlides");
if (n > x.length) {slideIndex = 1}
if (n < 1) {slideIndex = x.length}
for (i = 0; i < x.length; i++) {
x[i].style.display = "none";
}
x[slideIndex-1].style.display = "block";
}
setTimeout(showDivs, 2000);
</script>
最佳答案
您的 HTML 包含类名为“SlidePic”而非“mySlides”的图像。还需要从您重复要执行的函数中调用 stTimeOut 函数。希望这有帮助..
<link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css">
</head>
<body>
<h2 class="slide">Manual Slideshow</h2>
<div class="innerArea" style="max-width:800px;position:relative">
<div class="SlidePic">
<img class="" src="img_fjords.jpg" style="">
<p>Hello</p>
</div>
<div class="SlidePic">
<img src="image/oracle.png">
<p>Hello1</p>
</div>
<div class="SlidePic">
<img src="image/oracle.png">
<p>Hello2</p>
</div>
<div class="SlidePic">
<img src="img_forest.jpg">
<p>Hello3</p>
</div>
<a class="w3-btn-floating" style="position:absolute;top:45%;right:0" onclick="plusDivs(0)">></a>
<a class="w3-btn-floating" style="position:absolute;top:45%;left:0" onclick="plusDivs(-2)"><</a>
</div>
<script>
var slideIndex = 1;
showDivs(slideIndex);
function plusDivs(n) {
slideIndex += n;
showDivs();
}
function showDivs() {
var n = slideIndex;
// alert(n) ;
if(n==='' || n==='0' || n==="undefined")
n=1;
var i;
var x = document.getElementsByClassName("SlidePic");
if (n > x.length) {slideIndex = 1}
if (n < 1) {slideIndex = x.length}
for (i = 0; i < x.length; i++) {
x[i].style.display = "none";
}
x[slideIndex-1].style.display = "block";
slideIndex++;
var t = setTimeout(function(){showDivs() }, 2000);
}
</script>
</body>
</html>
关于javascript slider 不会自动滑动，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38091552/