怎么JS外部调用会有空行呢？？？

document.writeln('<li><a href="\/space-2" target="_blank" alt="dickson-chen" class="uonline"><img src="\/UCenter\/avatar.php?uid=237" onerror="this.onerror=null;this.src=\'\/ucenter\/images\/noavatar_small.gif\'"><\/a><\/li>');
document.writeln('');
document.writeln('<li><a href="\/space-1" target="_blank" alt="绮丽的北北" class="uonline"><img src="\/UCenter\/avatar.php?uid=140" onerror="this.onerror=null;this.src=\\/ucenter\/images\/noavatar_small.gif\'"><\/a><\/li>');
document.writeln('');


document.writeln('');
这个空行呢