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今天在升级我自己的语法高亮显示插件的时候, 发现在IE下, 都缺少了最后一行的显示, 如果pre中只有一行语句的时候, 就什么都不显示..
追踪了半天(IE下我只用Alert,,,), 最后发现, 如下语句在IE上运行的结果, 比在FF/Chrome中少1.

    var codes = document.getElementsByTagName("pre");
    alert(codes[0].length); //IE下如果是10, 那么在FF/Chrome中就是11

因为我的语法高亮插件, 是通过对最后一个字符是否为\n ,或者 \r来判断新行开始, 旧行结束的, 所以导致在IE下, 最后一行的内容永远不会显示..
原来, IE对所有要显示的data都做了text normalization, 即使是pre或者textarea这种应该保持原状的标签, 应该是这个原因, 导致在显示pre内容的时候, 行尾的回合换行被抹掉了.
有这个问题的IE包括: Explorer 6, 7, 8 (已验证)


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    或者 \r来判断新行开始, 旧行结束的, 所以导致在IE下, 最后一行的内容永远不会显示….

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