将JavaScript显示为代码段

Question

What I'm trying to do is display a snippet of javascript on the page, and not have it run, just display as a code snippet for folks to copy. I load google's Prettify, then in the page I have this code:

    <pre class="prettyprint">
    <script>
    $(document).ready(function(){
      setTimeout(function(){
        console.log('deleting cookie');
        $.cookie('cookie',null,{domain: document.domain});
     },1000);
    });
    </script>
   </pre>

But this code just executes and doesn't display the JS snippet. What am I missing here?

Answer 1

You need to convert your < and > characters to HTML entities like so:

<pre class="prettyprint">
  &lt;script&gt;
    $(document).ready(function(){
      setTimeout(function(){
        console.log('deleting cookie');
        $.cookie('cookie',null,{domain: document.domain});
      },1000);
    });
  &lt;/script&gt;
</pre>

I would also recommend wrapping the code in <code> tags in addition to the existing <pre> tags.

Answer 2

The problem you have is that you are entering HTML and you want it to not be treated as HTML. Specifically, the opening <script> element.

In order to enter HTML that will not be parsed as HTML, you need to encode characters that are special to HTML. For instance < is encoded as < , > is encoded as > , and & is encoded as & .

So, to output the following without it being parsed as HTML:

<script>...</script>

...you need to enter:

<script>...</script>

Answer 3

It's running because of the <script> tags. You should encode them:

<pre class="prettyprint">
&lt;script&gt;
$(document).ready(function(){
  setTimeout(function(){
    console.log('deleting cookie');
    $.cookie('cookie',null,{domain: document.domain});
 },1000);
});
&lt;/script&gt;
</pre>

Answer 4

use <script> and </script> for <script> tag

Answer 5

Let the textContent property (or createTextNode ) do all the heavy lifting of encoding whatever text you need to insert into dom:

var sampleCode="<script> $(document).ready(function(){ setTimeout(function(){ console.log('deleting cookie'); $.cookie('cookie',null,{domain: document.domain}); },1000); }); </script>";
var pre=document.createElement("pre");
pre.textContent=sampleCode;
pre.className="prettyprint";
document.body.appendChild(pre);