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alert(parseInt("101101", 2))

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function toBin(intNum) {
var answer = "";
if(/\d+/.test(intNum)) {
while(intNum != 0) {
answer = Math.abs(intNum%2)+answer;
intNum = parseInt(intNum/2);
}
if(answer.length == 0)
answer = "0";
return answer;
} else {
return 0;
}
}
alert(toBin(45))

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function toBin(dec) {
var bits = [];
var dividend = dec;
var remainder = 0;
while (dividend >= 2) {
remainder = dividend % 2;
bits.push(remainder);
dividend = (dividend - remainder) / 2;
}
bits.push(dividend);
bits.reverse();
return bits.join("");
}
alert(toBin(45))

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