Web10--jQuery进阶

在这个问题中，我们需要使用jQuery来创建一个简单的图片库。这个图片库应该能够在点击下一张或上一张按钮时更换显示的图片。

解决方案1：




<!DOCTYPE html>
<html>
<head>
<script src="/jquery/jquery-1.11.1.min.js"></script>
<script>
$(document).ready(function(){
  $(".next").click(function(){
    var imgSrc = $("#imageGallery img").attr("src");
    var lastDigit = parseInt(imgSrc.substr(imgSrc.length - 1));
    var nextDigit = (lastDigit + 1) % 3;
    var newSrc = "image" + nextDigit + ".jpg";
    $("#imageGallery img").attr("src", newSrc);
  });
 
  $(".previous").click(function(){
    var imgSrc = $("#imageGallery img").attr("src");
    var lastDigit = parseInt(imgSrc.substr(imgSrc.length - 1));
    var nextDigit = (lastDigit - 1 + 3) % 3;
    var newSrc = "image" + nextDigit + ".jpg";
    $("#imageGallery img").attr("src", newSrc);
  });
});
</script>
</head>
<body>
 
<p>Click the buttons to change the image in the gallery.</p>
 
<button class="previous">Previous</button>
 
<div id="imageGallery">
  <img src="image1.jpg" />
</div>
 
<button class="next">Next</button>
 
</body>
</html>

在这个解决方案中，我们使用jQuery的.attr()方法来改变图片的src属性，从而更换显示的图片。

解决方案2：




<!DOCTYPE html>
<html>
<head>
<script src="/jquery/jquery-1.11.1.min.js"></script>
<script>
$(document).ready(function(){
  var images = ["image1.jpg", "image2.jpg", "image3.jpg"];
  var currentIndex = 0;
 
  $(".next").click(function(){
    currentIndex = (currentIndex + 1) % images.length;
    $("#imageGallery img").attr("src", images[currentIndex]);
  });
 
  $(".previous").click(function(){
    currentIndex = (currentIndex - 1 + images.length) % images.length;
    $("#imageGallery img").attr("src", images[currentIndex]);
  });
});
</script>
</head>
<body>
 
<p>Click the buttons to change the image in the gallery.</p>
 
<button class="previous">Previous</button>
 
<div id="imageGallery">

Web10--jQuery进阶

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