word = words[index + 3];
index++;
if (word instanceof Integer) {
value = new ConstInteger(-((Integer) word));
} else if (word instanceof Double) {
value = new ConstDouble(-((Double) word));
} else {
throw new ParseException("不能识别的函数参数值");
}
} else if (word instanceof Integer) {
value = new ConstInteger((Integer) word);
} else if (word instanceof Double) {
value = new ConstDouble((Double) word);
} else if ("true".equals(word) || "yes".equals(word)
|| "on".equals(word)) {
value = new TrueCheck();
} else if ("false".equals(word) || "no".equals(word)
|| "off".equals(word)) {