ajax 请求设置header

在进行ajax请求时，可以使用beforeSend属性来设置header。在示例代码中，在发送请求之前，通过beforeSend函数设置了一个名为"token"的header，并将值设置为"tokenvalue"。这样，在发送ajax请求时会在请求头中包含这个header，以提供身份验证或其他需要的信息。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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