src/org/nutz/el/opt/object/AccessOpt.java
public Object fetchVar(){
        if(left instanceof Operator){
            return ((Operator) left).calculate();
        }
        if(left instanceof Elobj){
            return ((Elobj) left).fetchVal();
        }
        return left;
    }
public Object fetchVar(){
        if(left instanceof Operator){
            return ((Operator) left).calculate();
        }
        if(left instanceof Elobj){
            return ((Elobj) left).fetchVal();
        }
        return left;
    }
取得变得的值