问题
I'm trying to run a simple few lines of code using an index.html file and a script.js file, nothing else.
In the HTML file, I have doctype html:
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="javascript/script.js"></script>
</head>
<body>
<div id="content1">This is content 1 </div>
<div id="content2">This is content 2 </div>
<div id="content3">This is content 3 </div>
</body>
</html>
And for my javascript section i have:
var elems = $("div");
if (elems.length) {
var keep = Math.floor(Math.random() * elems.length);
for (var i = 0; i < elems.length; ++i) {
if (i !== keep) {
$(elems[i]).hide();
}
}
}
When I run this in CodePen, or even on the code editor on this website, it works fine. But it doesn't work when I use the files on my desktop (index.html, script.js I do believe the folder structure is correct (script.js is in the javascript folder.)
Thank you all
回答1:
Move your script tag just before the closing of the body tag:
<script src="javascript/script.js"></script>
</body>
This way the DOM will be available when your script runs.
If you prefer to keep your script in the head
part, then wrap your code in a DOMContentLoaded
event handler:
document.addEventListener("DOMContentLoaded", function() {
var elems = $("div");
if (elems.length) {
var keep = Math.floor(Math.random() * elems.length);
for (var i = 0; i < elems.length; ++i) {
if (i !== keep) {
$(elems[i]).hide();
}
}
}
});
... so to have your code run when the DOM is ready.
You did not tag your question with jquery
, but as you seem to use it, you can use this shorter code for doing essentially the same as above:
$(function() {
var $elems = $("div").hide(),
$elems.eq(Math.floor(Math.random() * $elems.length)).show();
});
回答2:
wrap your code in this function to execute it if the document is ready.
$(document).ready(function (){
// your code goes here
});
来源:https://stackoverflow.com/questions/43402675/code-works-in-codepen-but-not-with-my-desktop-files