getWPJRA.js

var getWPJRA = function( baseUrl, child , callback){
    if (baseUrl !== undefined ){
        switch( child ) {
            case undefined: 
                return jQuery.getJSON( '/' + baseUrl + "/wp-json" , callback);
                break;
            default:
                return jQuery.getJSON( '/' + baseUrl + "/wp-json/" + child, callback);
        }
    } else if (baseUrl === undefined || baseUrl.length == 0) {
        return jQuery.getJSON( "/wp-json" );
    }
}