轮询 Demo

poll.js

var URL= "https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%20in%20(select%20woeid%20from%20geo.places(1)%20where%20text%3D%22nome%2C%20ak%22)&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
/* 响应处理函数 */
function dealWithData(data) {
    // 处理响应数据
    console.log(data, Date.now());
    setTimeout(send, 1000); // 一秒后，再次轮询一次
}

/* 发送请求 */
function send() {
    $.get(URL, dealWithData);
}

send();// 启动轮询