获取服务器时间与本地时间

function ajax(option) {
  var xhr = null;
  if (window.XMLHttpRequest) {
    xhr = new window.XMLHttpRequest();
  } else { // ie
    xhr = new ActiveObject("Microsoft")
  }
  // 通过get的方式请求当前文件
  xhr.open("get", "http://www.baidu.com");
  xhr.send(null);
  // 监听请求状态变化
  xhr.onreadystatechange = function() {
    var time = null,
      curDate = null;
    if (xhr.readyState === 2) {
      // 获取响应头里的时间戳
      time = xhr.getResponseHeader("Date");
      console.log(xhr.getAllResponseHeaders())
      curDate = new Date(time);
      console.log("服务器时间: "+curDate);
      console.log("服务器时间是：" + curDate.getFullYear() + "-" + (curDate.getMonth() + 1) + "-" + curDate.getDate() + " " + curDate.getHours() + ":" + curDate.getMinutes() + ":" + curDate.getSeconds());
      var cTime = new Date();
      console.log("客户端时间: "+cTime);
      console.log("客户端时间是：" + cTime.getFullYear() + "-" + (cTime.getMonth() + 1) + "-" + cTime.getDate() + " " + cTime.getHours() + ":" + cTime.getMinutes() + ":" + cTime.getSeconds());
    }
  }
}
ajax();