HTML:非常简单,只需滑动带有更改图像的按钮即可。
<img src="https://i.ytimg.com/vi/QJg2z3rRgSE/maxresdefault.jpg" id="myslides">
<ul id="mylist">
<li><button class="btns" id="btn1">Previous</button></li>
<li><button class="btns" id="btn2">Next</button></li>
</ul>
CSS:我在这里不需要帮助,我不太喜欢设计。
#myslides {
height: 100%;
width: 100%;
margin-left: auto;
margin-right: auto;
}
#mylist,
li {
display: inline-block;
position: relative;
top: -5px;
left: -20px
}
.btns {
height: 50px;
width: 200px;
background: #666666;
color: white;
font-size: 20px;
}
JQuery:我不知道我在这里做错了什么。 “图像”不能未定义,因为它不是“img”,那么为什么 src 更改不起作用?
$(docuent).ready(function() {
var slide = $("#myslides");
$("#btn2").click(function() {
if (slide.attr("src") == "https://i.ytimg.com/vi/QJg2z3rRgSE/maxresdefault.jpg") {
slide.attr("src", "https://techgage.com/wp-content/uploads/2015/11/The-Witcher-3-Wild-Hunt-at-3440x1440-Resolution.jpg");
}
});
});
$(docuent).ready(function() {
var slide = $("#myslides");
$("#btn2").click(function() {
if (slide.attr("src") == "https://i.ytimg.com/vi/QJg2z3rRgSE/maxresdefault.jpg") {
slide.attr("src", "https://techgage.com/wp-content/uploads/2015/11/The-Witcher-3-Wild-Hunt-at-3440x1440-Resolution.jpg");
}
});
});
#myslides {
height: 100%;
width: 100%;
margin-left: auto;
margin-right: auto;
}
#mylist,
li {
display: inline-block;
position: relative;
top: -5px;
left: -20px
}
.btns {
height: 50px;
width: 200px;
background: #666666;
color: white;
font-size: 20px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<img src="https://i.ytimg.com/vi/QJg2z3rRgSE/maxresdefault.jpg" id="myslides">
<ul id="mylist">
<li><button class="btns" id="btn1">Previous</button></li>
<li><button class="btns" id="btn2">Next</button></li>
</ul>
最佳答案
您拼错了 document
。如果您正在寻找一种更具可扩展性的方法来制作 slider ,您可以尝试这样的方法:
$(document).ready(function () {
var visibleSlide = $("#myslides");
var slideList = [
"https://i.ytimg.com/vi/QJg2z3rRgSE/maxresdefault.jpg",
"https://techgage.com/wp-content/uploads/2015/11/The-Witcher-3-Wild-Hunt-at-3440x1440-Resolution.jpg"
];
var currentSlideIndex = 0;
$("#btn1").click(function () {
changeSlide('previous');
});
$("#btn2").click(function () {
changeSlide('next');
});
function changeSlide(direction) {
switch(direction) {
case 'previous':
if (currentSlideIndex > 0) {
currentSlideIndex--;
}
break;
case 'next':
if (currentSlideIndex < slideList.length - 1) {
currentSlideIndex++;
}
break;
default:
// no-op
}
visibleSlide.attr('src', slideList[currentSlideIndex]);
}
});
参见 CodePen .
如果您没有在页面上加载 jQuery,我已将其添加到您的 HTML 底部:
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
关于javascript - 如何使用 JQuery 的 else/if 语句更改图像 src?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52108507/