Global variable defined outside of javascript file does not work -

Global variable defined outside of javascript file does not work -

i have html file:

<body>   <?php      $rand1 = rand(0,10);     $rand2 = rand(0,20);   ?>    <span id="client-registration-button">registration</span>    <script>var checksum = <?php echo $rand1+$rand2; ?>;</script>   <script src="/main.js"></script> </body>

and in main.js is:

$('#client-registration-button').click(function() {              alert(checksum);     });

but alert shows no value, empty alert window. why there no value of global variable "checksum" displayed?

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