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<!DOCTYPE html> <html> <body> <input type='text' id=“hid_id” class='hid_id' value='1' /> <button onclick="myFunction()">Click me</button> <script> function myFunction() { var id = document.getElementsByClassName("hid_id"); if (id.length > 0) { alert (id[0].value); } } </script> </body> </html>