Is using $ = jQuery; within jQuery( window ).on( 'load', function() { okay?

Question

As $ is undefined in a jQuery( window ).on( 'load', function() { I use $ = jQuery; at the top of this code block and then I can use $ rather than typing jQuery wherever I want to use it like this:

jQuery( window ).on( 'load', function() {

    $ = jQuery;
    var test123 = $( '#test123' );

});

However I have seen on some websites I use this code on it sometimes can throw a Uncaught TypeError: Assignment to constant variable. message occasionally in the console.

Should I be using this method or is there a better alternative to use $ over jQuery

Answer 1

You can wrap it inside a try-catch.

try{
    window.$ = jQuery;
}catch(e){};
$(window).on('load', function(){
    var test123 = $('#test123');
});