study_javascript/addEventListener.html at master · cqupthjb/study_javascript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>addEventListener</title>
</head>
<body>
    <button id="myBtn1">试一试</button><hr>
    <button id="myBtn2">试二试</button><hr>
    <button id="myBtn3">试三试</button><hr>
    <div id="text" style="width: 100px; height: 50px; background-color: yellow">试四试</div>
    <p id="demo"></p>
    <script>
        document.getElementById('myBtn1').addEventListener('click', displayDate);
        document.getElementById('myBtn2').addEventListener('click', function() {
            alert('Hello world!');
        });
        document.getElementById('myBtn3').addEventListener('click', myFunction_1);
        document.getElementById('myBtn3').addEventListener('click', myFunction_2);
        document.getElementById('text').addEventListener('mouseover', function(){
            myFunction_3(this);
        });
        document.getElementById('text').addEventListener('mouseout', function() {
            myFunction_4(this);
        });
        function displayDate() {
            document.getElementById('demo').innerHTML = Date();
        }
        function myFunction_1() {
            alert('这是我的第一个函数');
        }
        function myFunction_2() {
            alert('这是我的第二个函数');
        }
        function myFunction_3(obj) {
            obj.style.backgroundColor = 'black';
        }
        function myFunction_4(obj) {
            obj.style.backgroundColor = 'yellow';
        }
    </script>
</body>
</html>