|| "off".equals(word)) {
value = new FalseCheck();
} else if ("null".equals(word)) {
value = new NullExpression();
} else if (word instanceof String) {
value = new StringExpression((String) word);
} else {
throw new ParseException("不能识别的函数参数值");
}
if (index + 3 < wordSize && words[index + 3] == Operation.C_B_OR) {