javascript and PHP problem

i have a problem when trying to include php with javascript

i have an:

if(document.getElementById(acheckbox).checked==true){
<?php $result=$result."开发者_运维知识库bar-";?>
}
else{
<?php $result=$result."none";?>
}

but both are executed... so $result is>>>bar-none how can i solve this problem??? please help!

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That JavaScript code, while it's in a source file on your server, is just plain text to output.

It's not code that's executed by the PHP interpreter.

Both pieces of PHP code will always run.

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your else statement needs to be written in php not in javascript.

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You must be put echo.

<?php echo $result."food" ?>

other wise you should write like this

<?=$?>