使用按钮将img src的一部分替换为多个图像

Question

我有这个简单的HTML：

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"> <button href="#" class="btn btn-primary">Small (32)</button> <button href="#" class="btn btn-danger">Medium (64)</button> <button href="#" class="btn btn-warning">Large (128)</button> <hr /> <img class="swap" title="jack-o-lantern" alt="jack-o-lantern" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/1f383.png"> <img class="swap" title="Christmas tree" alt="Christmas tree" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/1f384.png"> <img class="swap" title="fireworks" alt="fireworks" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/1f386.png"> <img class="swap" title="sparkler" alt="sparkler" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/1f387.png"> <img class="swap" title="sparkles" alt="sparkles" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/2728.png"> 

我正在尝试找出是否有可能通过单击代码片段顶部的按钮来使用javascript设置图像源。

例如-首次加载页面时，图片网址被硬编码为：

https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/1f383.png

但是，如果用户单击“ Small (32)按钮，是否可以在不将页面加载到例如单个图像的情况下更新所有图像源URL：

https://cdn.jsdelivr.net/emojione/assets/3.1/png/32/1f383.png

相当于“中”和“大”按钮？

我已经搜索了例如替换img src的一部分，并找到了这篇文章：

更改图像来源的一部分

使用此解决方案：

$(function(){
  $('#myLink').click(function(){
    $('img').each(function(){
      var $this = $(this)
      $this.attr('src',$this.attr('src').replace('gray','green'))
    })
  })
})

但是-就我而言，我不仅要用另一个替换一个值，还需要根据单击哪个按钮在32、64和128之间进行更改。

Answer 1

一个简单的解决方案是通过给每个按钮一个id来代表要更改此大小的数字，例如本示例

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"> <button href="#" id="32" class="btn btn-primary">Small (32)</button> <button href="#" id="64" class="btn btn-danger">Medium (64)</button> <button href="#" id="128" class="btn btn-warning">Large (128)</button> 

现在添加一个脚本，该脚本通过其ID选择所有这些按钮，然后将侦听器添加到click事件，并通过选择所有图像来更改所有图像的src属性

这是完整的解决方案

 const small = document.getElementById('32'); const medium = document.getElementById('64'); const large = document.getElementById('128'); // select all images const allImages = document.querySelectorAll('.swap') ; // this function takes number and change the src of all images function changeImagesSrc(number) { allImages.forEach(img=>{ // here we use regular expression to select the number and change it to a new one img.src = img.src.replace(/32|64|128/,number); }) } small.addEventListener('click',()=>{ changeImagesSrc(32); }) medium.addEventListener('click',()=>{ changeImagesSrc(64); }) large.addEventListener('click',()=>{ changeImagesSrc(128); }) 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"> <button href="#" id="32" class="btn btn-primary">Small (32)</button> <button href="#" id="64" class="btn btn-danger">Medium (64)</button> <button href="#" id="128" class="btn btn-warning">Large (128)</button> <hr /> <img class="swap" title="jack-o-lantern" alt="jack-o-lantern" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/1f383.png"> <img class="swap" title="Christmas tree" alt="Christmas tree" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/1f384.png"> <img class="swap" title="fireworks" alt="fireworks" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/1f386.png"> <img class="swap" title="sparkler" alt="sparkler" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/1f387.png"> <img class="swap" title="sparkles" alt="sparkles" src="https://cdn.jsdelivr.net/emojione/assets/3.1/png/128/2728.png">