1、题目:http://jsfiddle.net/FDPj3/1/
// 要求按“Button 1” 显示 “This is button: 1”,以此类推
for (var i = 1; i <= 3; i++) {
(function(){var tmp = i;
document.getElementById("btn" + i).onclick = function() {
alert("This is button: " + tmp);
};
})();
}