dist/jquery.lazyloadxt.extra.js
function getOrDef(obj, prop) {
        return obj[prop] === undefined ? options[prop] : obj[prop];
    }
function getOrDef(obj, prop) {
        return obj[prop] === undefined ? options[prop] : obj[prop];
    }
function getOrDef ( obj , prop ) { return obj [ prop ] === undefined ? options [ prop ] : obj [ prop ] ; }
Return options.prop if obj.prop is undefined, otherwise return obj.prop
@param {*} obj
@param {*} prop
@returns *
Return options . prop if obj . prop is undefined otherwise return obj . prop