javascript的字节换算

function GetSizeType(size:Number) { if (size<1024) {  return int(size*100)/100+" bytes"; } if (size<1048576) {  return int((size/1024)*100)/100+"KB"; } if (size<1073741824) {  return int((size/1048576)*100)/100+"MB"; } return int((size/1073741824)*100)/100+"GB";}