<script type="text/javascript">  //ex01  var mess = "我是最原始的信息";  setTimeout(function(){document.writeln(mess+"<br/>")},1000);  mess = "我是修改后的信息";  setTimeout(function(){document.writeln(mess+"<br/>")},1000);  //ex02  function delayedShow(message,time){  setTimeout(function(){  document.writeln(message+"<br/>");  },1000)   }  var message = "我是最原始的信息";  delayedShow(message,1000);  message = "我是修改后的信息";  delayedShow(message,1000);  </script>

<input type="button" value="Button 1" id="btn1">
<input type="button" value="Button 2" id="btn2">
<input type="button" value="Button 3" id="btn3">    <script type="text/javascript">  function createEventHandlers(){  var btn;  for(var i=1; i <= 3; i++){  btn = document.getElementById('btn' + i);  btn.onclick = function(){  alert('Clicked button #' + i);  }  }  }  createEventHandlers();
</script>

function createEventHandlers(){  var btn;  for(var i=1; i <= 3; i++){  btn = document.getElementById('btn' + i);  btn.onclick = createOneHandler(i);  }
}    function createOneHandler(number){  return function() {  alert('Clicked button #' + number);  }
}

<script type="text/javascript">  //ex01  var i = 1;  click1 = function() {  document.writeln("click button"+i);   }  i = 2;  click2 = function(){  document.writeln("click button"+i);   }  i = 3;  click3 = function (){  document.writeln("click button"+i);   }  //点击第一个按钮  click1();  //点击第二个按钮  click2();  //点击第三个按钮  click3();  //ex02  click5=function(k){  return function(){  document.writeln("click button"+k);  }     }  var j = 1;  bclick1=click5(j);  j = 2;  bclick2=click5(j);  j = 3;  bclick3=click5(j);  bclick1();  bclick2();    bclick3();  </script>

// 利用包装器来创建一个匿名函数
(function(){
// 在这变量在这个包装器内是一个全局变量
var msg = "Thanks for visiting!";
// 将一个方法绑定到全局变量上
window.onunload = function(){
// 这里使用“被隐藏”起来的全局变量
alert( msg );
};
// 关闭匿名函数并且执行它
})();

var f = function(){
var msg = "Thanks for visiting!";
window.onunload = function(){
alert( msg );
};
};
f();