题解 |JS23 验证是否是身份证

        const _isCard = number => {
            // 补全代码
            const length = number.length;
            if(length !== 18){
                return false;
            }
            for(let i = 0;i < length-1; i++){
                if(number[i] > '9' || number[i] < '0'){
                    return false;
                }
            }
            if(number[length-1]=== 'X' || (number[length -1] > '0' && number[length-1] < '9')){
                return true;
            }else{
                return false;
            }
        }