public static boolean isLetter(CharSequence value) {
		return StrUtil.isAllCharMatch(value, Character::isLetter);
	}
@Test
	public void isLetterTest() {
		assertTrue(Validator.isLetter("asfdsdsfds"));
		assertTrue(Validator.isLetter("asfdsdfdsfVCDFDFGdsfds"));
		assertTrue(Validator.isLetter("asfdsdf你好dsfVCDFDFGdsfds"));
	}