docs: public static Object execExpr(ExprResolver exprResolver, String expression) {
  
          try {
              // 返回输出的内容
              return exprResolver.executeExpr(expression);
  
          } catch (Exception e) {
  
              // 输出日志
              if (logger.isDebugEnabled()) {
                  logger.debug("Can't resolving expression: " + expression, e);
              }
          }
  
          return null;
      }