js事件学习的小demo

直接上代码：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>JavaScript事件</title>            
    </head>

    <body>        
        <p>示例使用 addEventListener() 方法在同一个按钮中添加多个事件。</p>

        <button id="myBtn">点我</button>

        <p id="demo"></p>

        <script>
        var obj = document.getElementById("myBtn");
        obj.addEventListener("mouseover", myFunction);
        obj.addEventListener("click", mySecondFunction);
        obj.addEventListener("mouseout", myThirdFunction);

        function myFunction() {
            document.getElementById("demo").innerHTML += "Moused over!<br>"
        }

        function mySecondFunction() {
            document.getElementById("demo").innerHTML += "Clicked!<br>"
        }

        function myThirdFunction() {
            document.getElementById("demo").innerHTML += "Moused out!<br>"
        }
        </script>

    </body>
</html>