将PHP变量设置为JavaScript代码? [重复]

This question already has an answer here:

I need to change the value of a PHP variable to JavaScript code.

The value of the PHP variable has to be something out of (JavaScript) localStorage.

So it is something like this.

$variable = localStorage.anameofalocalstorage; //The localstorage part is js

How can I do this?

</div>

This is an example code using jquery for the ajax call.

<?php

$variable_that_should_be_set=isset($_GET['shoudBeSet'])?$_GET['shoudBeSet']:'notSet';

?>

<html>
    <head>
        <script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>

    </head>
    <body>
        <div id="div1"><?php echo $variable_that_should_be_set;?></div>
        <a href="#" id="button">Click here to Set</a>
        <script>
            $("#button").click( function () {
                $.get("?shouldBeSet=this_is_set")   
            })
        </script>
    </body>
</html>