auth.indexOf

根据提供的引用内容，auth.indexOf是一个用于判断字符串中是否包含特定字符或子串的方法。具体使用方式可以参考文档中给出的例子：if($('Email').value.indexOf('@')==-1 || $('Email').value.indexOf('.')==-1)。在这个例子中，如果字符串"Email"中不包含字符"@"或"."，则会弹出窗口提示"邮件输入不正确！"，并返回false。这个方法可以用于验证用户输入的邮箱是否符合要求。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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