A small function that prompts specified messages through JS on the page

/*
 * Function: Specify the message through JS prompt on the page, and end the page execution
 * Parameter:
 * Msg: The message to be displayed
 * URL: The page to be returned needs to be specified , return to the previous page if not specified
 */
 function ShowMsg($Msg, $URL = "")
 {
 //header('Content-Type: text/html; charset =utf-8');
 //echo '';
 echo "";
 exit();
 }