题解 | #二进制转换#

    function convertToBinary(num) {
        let newnum = num.toString(2);
        let length = num.toString(2).length;
        let a;
        if(length < 8){
             a = 8 - length;
             let b = new Array(a);
             return b.fill(0).join() + newnum;
        }

        return newnum;

}