用chrome的snippets测试
setInterval('window.location.reload()',1000); //指定1秒刷新一次
刷新一次后就中断，并警告
Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/.
XHR请求改同步的，要不异步你刷新页面会导致ajax被中断，报的应该是中断的错误