instanceof,typeof

 

为什么结果会是false呢？

1     <script type="text/javascript">
2         var aColors = ["red", "green", "blue"];
3         alert(typeof aColors[0]);                   //output "string"
4          alert(aColors[0] instanceof String);        //output "false";
5      </script>

 

 

 

 

 

posted @ 2010-03-24 10:59  ued  阅读(753)  评论(3)    收藏  举报