表单自动获得焦点案例
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<script>
window.onload=function(){
var txt=document.getElementById("txt");
txt.focus(); //表单自动获得焦点的方法
}
</script>
</head>
<body>
<input type="text" id="txt"/>
</body>
</html>

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