谁能帮我解释一下这运行结果是怎么出来的吗？

<script type="text/javascript">

  var myarr1 = new Array("Hello","John","love","JavaScript"); 

  var myarr2 = new Array("80","16","50","6","100","1");

  document.write(myarr1.sort()+"<br>");

  document.write(myarr2.sort());

</script>

运行结果：

Hello,JavaScript,John,love

1,100,16,50,6,80