JavaScript -- 知识点回顾篇（八）：js中的事件Event的使用
事件通常与函数配合使用，这样就可以通过发生的事件来驱动函数执行。
(1) onabort : onabort 事件会在图像加载被中断时发生。
<!doctype html>
<html>
<head>
<script type="text/javascript">
function abortImage()
{
alert('Error: Loading of the image was aborted')
}
</script>
</head>
<body>
<img src="test.jpg" onabort="abortImage()" />
</body>
</html>
(2) onblur :元素失去焦点时触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function txtToupper(){
var x=document.getElementById("txt1").value
document.getElementById("txt1").value=x.toUpperCase()
}
</script>
</head>
<body>
输入小写字母：
<input type="text" id="txt1" onblur="txtToupper()" />
</body>
</html>
(3) onchange :域的内容被改变触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function txtToupper(){
var x=document.getElementById("txt1").value
document.getElementById("txt1").value=x.toUpperCase()
}
</script>
</head>
<body>
输入小写字母：
<input type="text" id="txt1" onchange="txtToupper()" />
</body>
</html>
(4) onclick :当用户点击某个对象时触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function txtToupper(){
var x=document.getElementById("txt1").value
document.getElementById("txt1").value=x.toUpperCase()
}
</script>
</head>
<body>
<button onclick="txtToupper()">点我一下</button>
<input type="text" id="txt1" />
</body>
</html>
(5) ondblclick :当用户双击某个html元素时触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function txtToupper(){
var x=document.getElementById("txt1").value
document.getElementById("txt1").value=x.toUpperCase()
}
</script>
</head>
<body>
<button ondblclick="txtToupper()">点我一下</button>
<input type="text" id="txt1" />
</body>
</html>
(6) onerror :在加载文档或图像时发生错误触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function loadImageError(){
alert('Error: Loading of the image was aborted')
}
</script>
</head>
<body>
<img src="test.jpg" onabort="loadImageError()" />
</body>
</html>
(7) onfocus :元素获得焦点触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(x){
document.getElementById(x).style.background="green";
}
</script>
</head>
<body>
<input type="text" id="txt1" onfocus="setStyle(this.id)" />
</body>
</html>
(8) onkeydown :某个键盘按键被按下触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(x){
document.getElementById(x).style.background="green";
}
</script>
</head>
<body>
<input type="text" id="txt1" onkeydown="setStyle(this.id)" />
</body>
</html>
(9) onkeypress :某个键盘按键被按下并松开触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(x){
document.getElementById(x).style.background="green";
}
</script>
</head>
<body>
<input type="text" id="txt1" onkeypress="setStyle(this.id)" />
</body>
</html>
(10) onkeyup :某个键盘按键被松开触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(x){
document.getElementById(x).style.background="green";
}
</script>
</head>
<body>
<input type="text" id="txt1" onkeyup="setStyle(this.id)" />
</body>
</html>
(11) onload :一张页面或一幅图像完成加载触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function alertLoadingPageInfo(){
alert('页面加载中');
}
</script>
</head>
<body onload="alertLoadingPageInfo()">
</body>
</html>
(12) onmousedown :鼠标按钮被按下触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(x){
document.getElementById(x).style.background="green";
}
</script>
</head>
<body>
<input type="text" id="txt1" onmousedown="setStyle(this.id)" />
</body>
</html>
(13) onmousemove :鼠标被移动触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(x){
document.getElementById(x).style.background="green";
}
</script>
</head>
<body>
<input type="text" id="txt1" onmousemove="setStyle(this.id)" />
</body>
</html>
(14) onmouseout :鼠标从某元素移开触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(x){
document.getElementById(x).style.background="green";
}
</script>
</head>
<body>
<input type="text" id="txt1" onmouseout="setStyle(this.id)" />
</body>
</html>
(15) onmouseover :鼠标移到某元素之上触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(x){
document.getElementById(x).style.background="green";
}
</script>
</head>
<body>
<input type="text" id="txt1" onmouseover="setStyle(this.id)" />
</body>
</html>
(16) onmouseup :鼠标按键被松开触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(x){
document.getElementById(x).style.background="green";
}
</script>
</head>
<body>
<input type="text" id="txt1" onmouseup="setStyle(this.id)" />
</body>
</html>
(17) onreset :重置按钮被点击触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(){
document.getElementById('txt1').style.background="yellow";
}
</script>
</head>
<body>
<form onreset="setStyle()">
<input type="text" id="txt1" />
<input type="reset" value="Reset" />
</form>
</body>
</html>
(18) onresize :窗口或框架被重新调整大小触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(){
document.getElementById('txt1').style.background="yellow";
}
</script>
</head>
<body onresize="setStyle()">
<input type="text" id="txt1" />
</body>
</html>
(19) onselect :文本被选中触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function setStyle(){
document.getElementById('txt1').style.background="yellow";
}
</script>
</head>
<body>
<input type="text" id="txt1" /><br/>
<input type="text" onselect="setStyle()" />
</body>
</html>
(20) onunload :用户退出页面触发该事件。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function alertClosePageInfo(){
alert('将会关闭本页面');
}
</script>
</head>
<body onunload="alertClosePageInfo()">
</body>
</html>
