​x
 
<!DOCTYPE html>
<html>
<head>
<script>
function setCookie(cname,cvalue,exdays) {
  var d = new Date();
  d.setTime(d.getTime() + (exdays*24*60*60*1000));
  var expires = "expires=" + d.toGMTString();
  document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}
​
function getCookie(cname) {
  var name = cname + "=";
  var decodedCookie = decodeURIComponent(document.cookie);
  var ca = decodedCookie.split(';');
  for(var i = 0; i < ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0) == ' ') {
      c = c.substring(1);
    }
    if (c.indexOf(name) == 0) {
      return c.substring(name.length, c.length);
    }
  }
  return "";
}
​
function refresh(){
  window.location.reload();
}
​
function helloworld()
{
  var unloadCount = getCookie('unloadCount');
  if( unloadCount == '' ){
    unloadCount = 0;
    setCookie( 'unloadCount' , unloadCount );
    document.getElementById("unloadCount").innerHTML = "你第一次访问该页面，尚未离开过。";
  }
  else{
    document.getElementById("unloadCount").innerHTML = "你已经离开页面<font color='red'> " + unloadCount + " </font>次了";
  }
}
​
// 很多浏览器会阻止 onunload 事件中的弹窗，因此本示例采用 Cookie 记录unload的次数
function goodbye()
{
  var unloadCount = getCookie('unloadCount');
  if( unloadCount == '' ){
    unloadCount = 0;
  }
  else{
    unloadCount = parseInt(unloadCount);
  }
  unloadCount += 1;
  setCookie( 'unloadCount' , unloadCount );
}
​
​
</script>
</head>
​
<body onunload="goodbye()" onload="helloworld()">
​
<h1>欢迎访问我的主页</h1>
<p>很多浏览器会阻止 onunload 事件中的弹窗，因此本示例采用 Cookie 记录unload的次数</p>
<p>关闭窗口或者按 F5 刷新页面，或者按 <input type="button" value="点击刷新页面" onclick="refresh()" /> 页面。</p>
​
<div id="unloadCount"></div>
​
</body>
</html>