循环和ajax的困难

You are passing the entire array each time. You need to use your index argument and only pass the current element you are looping over.

var codReferencia = ['1111','2222','3333','4444'];

$.each(codReferencia, function(index, val) {
    $.ajax({
        url: "https://webapi.toqueacampainha.com.br/api/estoque/produtoprontaentrega?refid=" + codReferencia[index],
        codeReference: codReferencia[index],
        dataType: 'json'
    })
    .done(function(response) {
        if ( response >= '1' ) {
            console.log('do anything: ' + this.codeReference);
        } else {
            console.log('do not do anything');
        };
    });
});