function bytesToSize(bytes) { if (bytes === 0) return '0 B'; var k = 1024, // or 1000 sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'], i = Math.floor(Math.log(bytes) / Math.log(k)); return (bytes / Math.pow(k, i)).toFixed(1) + ' ' + sizes[i]; }
摘自 http://www.cnblogs.com/interdrp/p/5869285.html