javascript - How to convert binary fraction to decimal -
javascript has function parseint() can convert integer in binary form decimal equivalent: parseint("101", 2) // 5 however, need convert binary fraction decimal equivalent, like: 0.101 = 0.625 i can write own function calculate result following: 1 * math.pow(2, -1) + 0*math.pow(2, -2) + 1*math.pow(2, -3) // 0.625 but i'm wondering whether there standard already. you can split number (as string) @ dot , treat integer part own function , fraction part function right value. the solution works other bases well. function convert(v, base) { var parts = v.tostring().split('.'); base = base || 2; return parseint(parts[0], base) + (parts[1] || '').split('').reduceright(function (r, a) { return (r + parseint(a, base)) / base; }, 0); } document.write(convert(1100) + '<br>'); document.write(convert(0.0011) + '<br>'); document.write(convert(1100.0011) + '<br...