javascript - Uncaught TypeError: Cannot read property 'each' of null

Question

$('img').each(function() {
    if (this.src.indexOf('larger') !== -1) {
        var normalized = this.src.replace('larger', 'normalized');
        console.log('found', normalized);
        window.open(normalized);
    };
});

I don't have any experience. I found this snippet and tried to run it but I kept getting Uncaught TypeError: Cannot read property 'each' of null. Now it's more about why I couldn't figure this out.

question from:https://stackoverflow.com/questions/65951763/uncaught-typeerror-cannot-read-property-each-of-null

Answer 1

Waitting for answers