entityMap|blocks|key|ef6a7|text|您需要首先设置c+=+1，这样%2B%2Bc才能正常工作：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|96q4d|(有些程序员喜欢在0和1之间切换，而您的原始代码则在1和2之间切换。两者都起作用，这取决于你。)|1n85q|在0和1之间切换|8ggm8|(我也可能使用prop()而不是attr()，但为了使其与原始版本保持一致：)|eb16g|​|etfd9|let+c+=+0;

setInterval(function()+{
++if+(c+===+0)+{
++++imgExt+=+'https://i.imgur.com/GCPeHoX.png';
++++%2B%2Bc;
++}+else+{
++++imgExt+=+'https://i.imgur.com/J2wgZZb.png';
++++--c;
++}
++//++document.querySelector('#floorImgId').src+=+imgExt;
++$('#floorImgId').attr('src',+imgExt);
},+1000);|code-block|syntax|javascript|709hm|<script+src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<img+id="floorImgId">|42glj|5vk0o|如果只是切换，我倾向于使用：|1ds4e|8sq|let+toggle+=+true;
setInterval(function()+{

++if+(toggle)+{
++++imgExt+=+'https://i.imgur.com/GCPeHoX.png';
++}+else+{
++++imgExt+=+'https://i.imgur.com/J2wgZZb.png';
++}
++toggle+=+!toggle;

++//++document.querySelector('#floorImgId').src+=+imgExt;
++$('#floorImgId').attr('src',+imgExt);
},+1000);|5326k|<script+src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<img+id="floorImgId">|ofd8|ach4p|为了隐藏toggle，这样它就不会污染外部作用域，只需将整个东西包装在一个生命中，或者您也可以使用：|9l654|dd2ab|setInterval((function()+{
++let+toggle+=+true;

++return+function()+{
++++if+(toggle)+{
++++++imgExt+=+'https://i.imgur.com/GCPeHoX.png';
++++}+else+{
++++++imgExt+=+'https://i.imgur.com/J2wgZZb.png';
++++}
++++toggle+=+!toggle;

++++//++document.querySelector('#floorImgId').src+=+imgExt;
++++$('#floorImgId').attr('src',+imgExt);
++};

}()),+1000);|2jfda|<script+src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<img+id="floorImgId">|e62es|f4t75^0|7|5|F|3|0|9|1|B|1|Q|1|S|1|0|1|1|3|1|0|7|6|G|6|0|0|0|0|0|0|0|0|0|0|4|6|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|1D|9|@$A|1E|B|1F|C|D]|$A|1G|B|1H|C|D]]|E|@]|F|$]]|$2|G|4|H|6|7|8|1I|9|@$A|1J|B|1K|C|D]|$A|1L|B|1M|C|D]|$A|1N|B|1O|C|D]|$A|1P|B|1Q|C|D]]|E|@]|F|$]]|$2|I|4|J|6|7|8|1R|9|@$A|1S|B|1T|C|D]|$A|1U|B|1V|C|D]]|E|@]|F|$]]|$2|K|4|L|6|7|8|1W|9|@$A|1X|B|1Y|C|D]|$A|1Z|B|20|C|D]]|E|@]|F|$]]|$2|M|4|N|6|7|8|21|9|@]|E|@]|F|$]]|$2|O|4|P|6|Q|8|22|9|@]|E|@]|F|$R|S]]|$2|T|4|U|6|Q|8|23|9|@]|E|@]|F|$R|S]]|$2|V|4|N|6|7|8|24|9|@]|E|@]|F|$]]|$2|W|4|X|6|7|8|25|9|@]|E|@]|F|$]]|$2|Y|4|N|6|7|8|26|9|@]|E|@]|F|$]]|$2|Z|4|10|6|Q|8|27|9|@]|E|@]|F|$R|S]]|$2|11|4|12|6|Q|8|28|9|@]|E|@]|F|$R|S]]|$2|13|4|N|6|7|8|29|9|@]|E|@]|F|$]]|$2|14|4|15|6|7|8|2A|9|@$A|2B|B|2C|C|D]]|E|@]|F|$]]|$2|16|4|N|6|7|8|2D|9|@]|E|@]|F|$]]|$2|17|4|18|6|Q|8|2E|9|@]|E|@]|F|$R|S]]|$2|19|4|1A|6|Q|8|2F|9|@]|E|@]|F|$R|S]]|$2|1B|4|N|6|7|8|2G|9|@]|E|@]|F|$]]|$2|1C|4|-4|6|7|8|2H|9|@]|E|@]|F|$]]]]

<p>You need to set <code>c = 1</code> to begin with, so that <code>++c</code> will work:</p>

<p>(some programmers like to toggle between <code>0</code> and <code>1</code>, while your original code toggled between <code>1</code> and <code>2</code>.  Both work and it is up to you.)</p>

<p>Toggling between <code>0</code> and <code>1</code>:</p>

<p>(I also might have used <code>prop()</code> instead of <code>attr()</code>, but to keep it close to your original version:)</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>let c = 0;

setInterval(function() {
  if (c === 0) {
    imgExt = 'https://i.imgur.com/GCPeHoX.png';
    ++c;
  } else {
    imgExt = 'https://i.imgur.com/J2wgZZb.png';
    --c;
  }
  //  document.querySelector('#floorImgId').src = imgExt;
  $('#floorImgId').attr('src', imgExt);
}, 1000);</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"&gt;&lt;/script&gt;
&lt;img id="floorImgId"&gt;</code></pre>
</div>
</div>
</p>

<p>If it is just toggle, I tend to just use:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>let toggle = true;
setInterval(function() {

  if (toggle) {
    imgExt = 'https://i.imgur.com/GCPeHoX.png';
  } else {
    imgExt = 'https://i.imgur.com/J2wgZZb.png';
  }
  toggle = !toggle;

  //  document.querySelector('#floorImgId').src = imgExt;
  $('#floorImgId').attr('src', imgExt);
}, 1000);</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"&gt;&lt;/script&gt;
&lt;img id="floorImgId"&gt;</code></pre>
</div>
</div>
</p>

<p>To hide the <code>toggle</code> so that it won't contaminate the outer scope, simply wrap the whole thing in an IIFE, or you can also use:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>setInterval((function() {
  let toggle = true;

  return function() {
    if (toggle) {
      imgExt = 'https://i.imgur.com/GCPeHoX.png';
    } else {
      imgExt = 'https://i.imgur.com/J2wgZZb.png';
    }
    toggle = !toggle;

    //  document.querySelector('#floorImgId').src = imgExt;
    $('#floorImgId').attr('src', imgExt);
  };

}()), 1000);</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"&gt;&lt;/script&gt;
&lt;img id="floorImgId"&gt;</code></pre>
</div>
</div>
</p>


entityMap|blocks|key|d8fal|text|从你的代码中，我认为你必须在else语句中增加c，在if语句中减少c：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|big29|c=0;
setInterval(function(){

+if(c+==+1){

+++++imgExt+=+'assets/images/resize.gif'
+++++--c;
+}
+else{
++++imgExt+=+'assets/images/resize.jpg';
+++++%2B%2Bc;
+}
//++document.querySelector('#floorImgId').src+=+imgExt;
+$('#floorImgId').attr('src',+imgExt);
},+3000)|code-block|syntax|javascript|4bfrm^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

<p>From your code, i think you have to increment c in else statement and decrement c in if statement:</p>

<pre><code>c=0;
setInterval(function(){

 if(c == 1){

     imgExt = 'assets/images/resize.gif'
     --c;
 }
 else{
    imgExt = 'assets/images/resize.jpg';
     ++c;
 }
//  document.querySelector('#floorImgId').src = imgExt;
 $('#floorImgId').attr('src', imgExt);
}, 3000)
</code></pre>


entityMap|blocks|key|1ooi|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|csoim|<!DOCTYPE+html>
<html>
<head>
<script+src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
</head>
<body>

<img+id="floorImgId"+src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/60/Hamiltonian_path.svg/440px-Hamiltonian_path.svg.png"+/>

<script>
var+c+=+1,imgExt+=+"";
setInterval(function(){

+if(c+==+1){

+++++imgExt+=+'https://upload.wikimedia.org/wikipedia/commons/thumb/6/60/Hamiltonian_path.svg/440px-Hamiltonian_path.svg.png'
+++++%2B%2Bc;
+}
+else{
++++imgExt+=+'https://buffer.com/library/wp-content/uploads/2016/06/giphy.gif';
+++++--c;
+}
+$('#floorImgId').attr('src',+imgExt);
},+3000);

</script>
</body>

</html>|code-block|syntax|javascript|6fv0v|1vtl3^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|J|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|K|9|@]|A|@]|B|$F|G]]|$2|H|4|5|6|7|8|L|9|@]|A|@]|B|$]]|$2|I|4|-4|6|7|8|M|9|@]|A|@]|B|$]]]]

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;

&lt;img id="floorImgId" src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/60/Hamiltonian_path.svg/440px-Hamiltonian_path.svg.png" /&gt;

&lt;script&gt;
var c = 1,imgExt = "";
setInterval(function(){

 if(c == 1){

     imgExt = 'https://upload.wikimedia.org/wikipedia/commons/thumb/6/60/Hamiltonian_path.svg/440px-Hamiltonian_path.svg.png'
     ++c;
 }
 else{
    imgExt = 'https://buffer.com/library/wp-content/uploads/2016/06/giphy.gif';
     --c;
 }
 $('#floorImgId').attr('src', imgExt);
}, 3000);

&lt;/script&gt;
&lt;/body&gt;

&lt;/html&gt;</code></pre>
</div>
</div>
</p>


<p>I am trying to display same image which is a gif(animated) and jpeg. I am changing the <code>src</code> every few seconds. </p>

<p>I see in the dev tools that the src has changed, but the gif does not animate.</p>

<pre><code>setInterval(function(){

 if(c == 1){

     imgExt = 'assets/images/resize.gif'
     ++c;
 }
 else{
    imgExt = 'assets/images/resize.jpg';
     --c;
 }
//  document.querySelector('#floorImgId').src = imgExt;
 $('#floorImgId').attr('src', imgExt);
}, 3000)`
</code></pre>

<p>It is changing when I inspect element, but in the page, the gif does not play. What am I doing wrong?</p>


change src of image every few seconds

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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 我试图显示相同的图像，这是一个gif(动画)和jpeg。我每隔几秒钟就会更换一次src。 我在dev工具中看到src已经改变，但是gif没有动画效果。 setInterval(function(){ if(c == 1){     imgExt = 'assets/images/resize.gif'     ++c...

问每隔几秒钟更改一次镜像的src
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问每隔几秒钟更改一次镜像的srcEN