js0004

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
<!DOCTYPE html>
<html>
<head>
<title>Registering event handlers</title>
<style>
#first { color: green;}
#second { color: red;}
</style>
</head>
<body>
<ul id="first"></ul>

<script>
function addMessage(element, message){
var messageElement = document.createElement("li");
messageElement.textContent = message;
element.appendChild(messageElement);
}

var first = document.getElementById("first");
addMessage(first, "Page loading");
</script>

<ul id="second"></ul>

<script>
document.body.addEventListener("mousemove", function() { //#A
var second = document.getElementById("second");
addMessage(second, "Event: mousemove");
});

document.body.addEventListener("click", function(){ //#B
var second = document.getElementById("second");
addMessage(second, "Event: click");
});
</script>
</body>
</html>

以上三个是页面构建的过程中 展示的部分测试代码