根据身份证号获取出生日期

function getBirthdayFromCardId(dataVal) {
//var returnStr = dataVal.substring(6, 10) + "-" + dataVal.substring(10, 12) + "-" + dataVal.substring(12, 14);
var returnStr = dataVal.substring(6, 10) + "-" + dataVal.substring(10, 12);
return returnStr;
}