循环请求服务器数据
function send () { xhr.open(‘GET‘, ‘/clock‘, true); xhr.onreadystatechange = function () { if (xhr.readyState === 4 && xhr.status === 200) { console.log(xhr.responseText); send() } } xhr.send() } send()
原文：https://www.cnblogs.com/wuxianqiang/p/10583302.html