匿名函数和闭包
var obj = document.getElementById("main");

obj.style.border = "1px solid red";

setTimeout(function(){
obj.style.display = 'none';
}, 1000);
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function delayedAlert(msg, time){
setTimeout(function(){
alert(msg);
}, time);
}

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function addGenerator(num){
return function(toAdd){
return num + toAdd;
}
}

var addFive = addGenerator(5);

alert(addFive(4) == 9);

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(function(){
var msg = "Thanks for visiting!";

window.onunload = function(){
alert(msg);
}
})();

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var obj = document.getElementById("main");

var items = ["click","keypress"];

for(var i=0;i<items.length;i++){
(function(){
var item = items[i];

obj["on" + item] = function(){
alert("Thanks for your " + item );
};
})()
}