How to disable javascript not executing in iphone? - wordpress

Question

I don't want to execute the script if the device is an iPad or iPhone. But it's showing error in the console. What is the reason for this?
<script>
var deviceAgent = navigator.userAgent.toLowerCase();
var agentID = deviceAgent.match(/(iphone|ipod|ipad)/);
if (!agentID) {
document.write('<script src="<?php echo get_template_directory_uri(). "/js/modernizr-2.6.2.min.js"?>"></script>'";
}
</script>
My current code is:
<script> var deviceAgent = navigator.userAgent.toLowerCase();
var agentID = deviceAgent.match(/(iphone|ipod|ipad)/);
if (!agentID)
document.write('<script src="<?php echo get_template_directory_uri(). "/js/modernizr-2.6.2.min.js"?>"></script>'
</script>

Answer 1

You miss some characters in your 4th line, try to edit this line.
You can also get the url in a specific var before your script in PHP, it'll be easier to avoid errors
$url = get_template_directory_uri() . "/js/modernizr-2.6.2.min.js";
...
<script> var deviceAgent = navigator.userAgent.toLowerCase();
var agentID = deviceAgent.match(/(iphone|ipod|ipad)/);
if (!agentID)
document.write('<script src="<?php echo $url ?>"></script>');
</script>