根据身份证号码查询年龄

//this.new_num=1311*************  
this.new_num.substring(6, 10) + "-" + this.new_num.substring(10, 12) + "-" + this.new_num.substring(12, 14);
                //获取年龄 
                var myDate = new Date();
                var month = myDate.getMonth() + 1;
                var day = myDate.getDate();
                var age = myDate.getFullYear() - this.new_num.substring(6, 10) - 1;
                if(this.new_num.substring(10, 12) < month || this.new_num.substring(10, 12) == month && this.new_num.substring(12, 14) <= day) {
                    age++;
                }
                if(age>18){
                    alert("成年人")
                }else{
                    alert("未成年")
                }