一个验证身份证号码有效性的小程序。身份证号码必须是18位，而且前17位必须是数字，最后一位只能是数字或小写字母x,第7到14位是出生年月日，必须符合有效性检测，即年在1900到2010之间，月要在1到12之间，日子要考虑闰年的情况。-Verify the identity card numbers of the effectiveness of the program. Identity card number must be 18, and 17 must be numeric, the last one can only be a number or lowercase letters x, 7-14 is the date of birth must conform to the effectiveness of detection, ie in 1900 to 2010, month between 1-12 days to consider the case of a leap year.