src/org/nutz/mapl/Mapl.java
public static void update(Object obj, String path, Object val) {
        put(obj, path, val);
    }
public static void update(Object obj, String path, Object val) {
        put(obj, path, val);
    }
更新

@param obj
原始的Maplist
@param path
路径
@param val
新的值