JavaScript call function with PHP-Variable as transfer parameter

Question

I am calling the JavaScript-function getElementById. As transfer parameter I want to use the PHP-Variable $currentTab

var currentTab = document.getElementById(<?php $currentTab ?>);

Answer 1

You need to add quotes, and output your variable with echo . Maybe add the # character if it is not in your php variable

document.getElementById('<?php echo $currentTab; ?>');

Answer 2

只需在' <?php $currentTab ?>周围添加'或" ，以使getElementById()接受字符串。而在javascript中，字符串则由'或"代替。