What is length check validation?
什么是长度检查验证？
A length check could be set up to ensure that exactly 11 numbers are entered into the field. This type of validation can't check that the 11 numbers are correct but it can ensure that 10 or 12 numbers aren't entered. A length check can also be set up to allow characters to be entered within a certain range.
可以设置长度检查以确保在该字段中输入了 11 个数字。 这种类型的验证无法检查 11 个数字是否正确，但可以确保没有输入 10 或 12 个数字。 还可以设置长度检查以允许在一定范围内输入字符。