Use of document.load() is deprecated. To upgrade your code, use the DOM XMLHttpRequest object. For more help https://developer.mozilla.org/en/XMLHttpRequest
已不赞成使用 document.load()。要升级您的代码，请改用 DOM XMLHttpRequest 对象。可访问 https://developer.mozilla.org/zh-CN/docs/Web/API/XMLHttpRequest 详细了解