三个数组a [2]、a[3]和a[4]的每个索引中的内容综合在一起就能提供关于所收到的RSSXML中某个特定rss提要条目的所有信息。
Contents in each index of the three arrays a [2], a [3], and a [4] put together will provide all the information related to one particular RSS feed item present in the received RSS XML.
回调函数拥有两个参数：第一个为对象的成员或数组的索引，第二个为对应变量或内容。
The callback has two arguments:the key (objects) or index (arrays) as the first, and the value as the second.
回调函数拥有两个参数：第一个为对象的成员或数组的索引，第二个为对应变量或内容。
The callback has two arguments:the key (objects) or index (arrays) as the first, and the value as the second.
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