JavaScript Double 2 IEEE754 format

doubel2ieee754.js

function toIEEE754( d ) {
  var a = new Float64Array( [ d ] );
  var b = new DataView( a.buffer );
  var f = [];
  for(var i = 0; i < b.byteLength; i ++ ){
    var k = b.getUint8( 7 - i );
    var e = k.toString( 2 );
    var p = new Array( 9 - e.length ).join( 0 );
    f.unshift( p + e );
  }
  return f.join( '' );
}

toIEEE754(3.1415926) === '0100000000001001001000011111101101001101000100101101100001001010'