Access to XMLHttpRequest
时间: 2023-08-27 19:15:07 浏览: 148
Access to XMLHttpRequest是指对XMLHttpRequest对象的访问。它可以通过发送HTTP请求与服务器进行通信,并获取服务器返回的数据。 在这个过程中,可能会遇到CORS(跨源资源共享)策略的限制。CORS是一种安全机制,用于保护浏览器免受跨域请求的恶意攻击。当浏览器在发送请求时,如果请求的源与目标服务器的源不一致,就会触发CORS策略,浏览器会阻止请求的发送并提示"Access to XMLHttpRequest at '*****' from origin 'null' has been blocked by CORS policy: Cross origin requests"。 为了解决这个问题,可以使用其他方法来发送跨域的请求,比如JSONP或使用代理服务器。在浏览器中使用JavaScript可以通过XMLHttpRequest对象来发送请求,例如使用xhr.open()方法来指定请求的方法和URL,通过xhr.setRequestHeader()方法来设置请求头,最后使用xhr.send()方法来发送请求并接收响应。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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