Convert Hexadecimal IEEE754 to Float in Javascript

hexIEEEtoFloat.js

var str = '0x41FC6733';

function parseFloat(str) {
  var float = 0, sign, order, mantiss,exp,
      int = 0, multi = 1;
  if (/^0x/.exec(str)) {
    int = parseInt(str,16);
  }else{
    for (var i = str.length -1; i >=0; i -= 1) {
      if (str.charCodeAt(i)>255) {
        console.log('Wrong string parametr'); 
        return false;
      }
      int += str.charCodeAt(i) * multi;
      multi *= 256;
    }
  }
  sign = (int>>>31)?-1:1;
  exp = (int >>> 23 & 0xff) - 127;
  mantissa = ((int & 0x7fffff) + 0x800000).toString(2);
  for (i=0; i<mantissa.length; i+=1){
    float += parseInt(mantissa[i])? Math.pow(2,exp):0;
    exp--;
  }
  return float*sign;
}

This was a very useful contribution, helped me convert a 4-byte decimal IEEE 754 encoded float32 value to its decimal value - thanks for sharing!