HTML DOM focus() 方法
JavaScript基础 2022-06-08 16:00:30小码哥的IT人生shichen
HTML DOM focus() 方法
定义和用法
focus() 方法用于向按钮赋予焦点。
语法
buttonObject.focus()
实例
下面的例子将在按钮上设置焦点:
<html>
<head>
<script type="text/javascript">
function setFocus()
{
document.getElementById('button1').focus()
}
</script>
</head>
<body>
<form>
<input type="button" id="button1" value="Button1" />
<br />
<input type="button" onclick="setFocus()"
value="Set focus to Button 1" />
</form>
</body>
</html>
TIY
完整实例【设置并从按钮上移开焦点】:
<html>
<head>
<script type="text/javascript">
function setFocus()
{
document.getElementById('button1').focus()
}
function removeFocus()
{
document.getElementById('button1').blur()
}
</script>
</head>
<body>
<form>
<input type="button" id="button1" value="Button1" />
<br /><br />
<input type="button" onclick="setFocus()" value="Set focus" />
<input type="button" onclick="removeFocus()" value="Remove focus" />
</form>
</body>
</html>
可以使用本站在线JavaScript测试工具测试上述代码运行效果:http://www.phpcodeweb.com/runjs.html