<script type="text/javascript">
window.onload=function(){
var s = "The rain in Spain falls mainly in the plain.";
var ss = s.split(" ");
for(var i in ss){
alert(ss[i]);
}
}
</script>上例子中i为遍历的索引0,1,2.。。。
原文：http://blog.csdn.net/ring_to_ping/article/details/45577129