问在Raphael.js中扩展_engine

EN

Raphael.fn.group = function() {
    var out = Raphael._engine.group(this);
    this.__set__ && this.__set__.push(out);
    return out;
};
(window.Raphael.svg &&
function(e) {
    e.group = function(svg) {
        //Want this to be called $ function defined in Raphael._engine 
        // as var $=function(..){..}
        // line 3780
        var el = $("g");
        svg.canvas && svg.canvas.appendChild(el);
        var res = new Element(el, svg);
        res.type = "group";
        return res;
    }
})(window.Raphael._engine);
var paper = Raphael("out", 800, 600);
//test with circle;
paper.circle(100, 100, 50);
//test with new method;
paper.group();​