如果我们在使用Hibernate3时同时拥有hbm和注释文件会发生什么？(What happen if we have both hbm as well as annotation file while using Hibernate3?)

 这样做的一种方法是在本地存储中设置某种“时间”属性（如果不存在）。 
 
if (localStorage.getItem('time') === null) {
  localStorage.setItem('time', 0);
}
 
 然后在循环期间，您可以增加本地存储中保存的时间量。 
 
var intervalTime = 1000;
setInterval(function() {
  // localStorage saves as strings so lets make it an integer
  var totalTime = parseInt(localStorage.getItem('time'));
  localStorage.setItem('time', totalTime + intervalTime);
}, intervalTime);
 
 这将节省用户在您的网站上花费的总毫秒数。 然后，您可以使用这些毫秒来显示他们在网站上的时长。 
 
var totalMilliseconds = parseInt(localStorage.getItem('time'));
var totalTime = new Date(totalMilliseconds);
var hours = totalTime.getHours();
var minutes = totalTime.getMinutes();
var seconds = totalTime.getSeconds();

One way of doing this would be to set some kind of "time" property in the local storage if one doesn't exist.
 
if (localStorage.getItem('time') === null) {
  localStorage.setItem('time', 0);
}
 
Then during a loop, you can increment the amount of time saved in the local storage.
 
var intervalTime = 1000;
setInterval(function() {
  // localStorage saves as strings so lets make it an integer
  var totalTime = parseInt(localStorage.getItem('time'));
  localStorage.setItem('time', totalTime + intervalTime);
}, intervalTime);
 
This will save the total number of milliseconds the user has spent on your site. You can then use those milliseconds to show how long they've been on the site.
 
var totalMilliseconds = parseInt(localStorage.getItem('time'));
var totalTime = new Date(totalMilliseconds);
var hours = totalTime.getHours();
var minutes = totalTime.getMinutes();
var seconds = totalTime.getSeconds();