tryjsref_onfocusin_eventdelegation 在线代码实例

实例代码( Tip: 登录后体验更佳 )
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool在线教程(w3cschool.cn)</title>
</head>
<body>
<p>当在 input 框输入时（获取焦点，FORM表单是子元素），一个函数将被触发，并设置背景颜色为黄色。当离开 input 输入框时（失去焦点）,另一个函数将被触发并移除背景颜色。</p>
<form id="myForm">
    <input type="text" id="myInput">
</form>
<p><strong>注意：</strong> Firefox 浏览器不支持 onfocusin 事件。</p>
<script>
var x = document.getElementById("myForm");
x.addEventListener("focusin", myFocusFunction);
x.addEventListener("focusout", myBlurFunction);
function myFocusFunction() {
    document.getElementById("myInput").style.backgroundColor = "yellow";  
}
function myBlurFunction() {
    document.getElementById("myInput").style.backgroundColor = "";  
}
</script>
</body>
</html>
 
 
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运行结果
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