十六、进制转换

1、十进制转化二进制

<script>
        var num = 10;
        var arr = [];
        while(num>0){
            arr.unshift(num%2);
            num = Math.floor(num/2);
        }
        console.log(Number(arr.join("")))
    </script>

2、二进制转十进制

<script>
        var num = 1010;
        str = (num+"").split("").reverse();
        console.log(str);
        var sum = 0;
        str.forEach((item,index)=>{
            console.log(item);
            console.log(index);
            sum+=item*Math.pow(2,index);
        })
        console.log(sum)
    </script>