vv-jsdt/lib/warn.js

validate based on vue2

/**
 * Created by chunyang.gao on 17/4/14.
 */
export default function warn(msg, err) {
    if (window.console) {
        console.warn('[vv-validator] ' + msg);
        if (err) {
            console.warn(err.stack);
        }
    }
}