String name = prototype.getClassName();
    private void installConstructor(FunctionObject fo, Scriptable prototype) {        ScriptRuntime.setFunctionProtoAndParent(global, fo);        fo.setImmunePrototypeProperty(prototype);        prototype.setParentScope(fo);        String name = prototype.getClassName();        ScriptableObject.defineProperty(global, name, fo, ScriptableObject.DONTENUM);        fo.setParentScope(global);    }