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EventHandler01.html
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EventHandler01.html
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<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<input type="button" name="myBtn" id="myBtn" value="button">
<p>
<a href="http://baidu.com" id="myA">测试取消连接的点击事件</a>
</p>
<p>
<input type="button" name="" value="button" id="myBtn1">
测试stopPropagation()方法,这个方法的作用是阻止事件流
</p>
<p>
<input type="button" name="" value="button" id="myBtn2">
测试eventPhase,这个方法的作用是可以显示事件片段
</p>
<script type="text/javascript">
/// 使用event handler 的type设置按钮
var button = document.getElementById("myBtn");
var handler = function(event) {
switch(event.type) {
case "click":
alert("clicked");3
break;
case "mouseover":
event.target.style.backgroundColor = "red";
break;
case "mouseout":
event.target.style.backgroundColor = "";
break;
}
};
button.onclick = handler;
button.onmouseover = handler;
button.onmouseout = handler;
/// 阻止事件的默认行为
var testA = document.getElementById("myA");
testA.onclick = function(event) {
event.preventDefault();
}
/// stopPropagation()阻止事件流
var btn1 = document.getElementById("myBtn1");
btn1.onclick = function(event) {
alert("btn1 clicked");
event.stopPropagation();
}
document.body.onclick = function() {
alert("body clicked");
}
/// 使用eventPhase显示事件片段
var btn2 = document.getElementById("myBtn2");
btn2.onclick = function(event) {
alert("btn2 onclick " + event.eventPhase);
}
document.body.addEventListener("click", function(event) {
alert("btn2 cap " + event.eventPhase);
}, true);
document.body.onclick = function(event) {
alert("btn2 body " + event.eventPhase);
}
</script>
</body>
</html>