src/org/nutz/mapl/impl/MaplEach.java
private String fetchPath(){
        StringBuffer sb = new StringBuffer();
        boolean first = true;
        for(String path : paths){
            if(!first){
                sb.append(".");
            }
            sb.append(path);
            first = false;
        }
        return sb.toString();
    }
private String fetchPath(){
        StringBuffer sb = new StringBuffer();
        boolean first = true;
        for(String path : paths){
            if(!first){
                sb.append(".");
            }
            sb.append(path);
            first = false;
        }
        return sb.toString();
    }
提取路径
@return