目录1.引言2.正文3.实例分析4.总结1.引言 2.正文 CAPTCHA的应用场景主要是在需要验证用户身份或者防止恶意攻击的场景中，下面列举几个常见的应用场景：
I\'m looking for a way to embed Flash into a XHTML Transitional page that does not rely on enabled JavaScript, which valid开发者_运维技巧ates and that works across all major Browsers including IE6.
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