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<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>csdn_test</title>
<script>
function test(){
document.getElementById("test").focus();
document.getElementById("test").select();
}
</script>
</head>
<body>
<input type="text" id="test" />
<input type="button" value="选中" id="btn" onclick="test()" />
</body>
</html>
如果只是获取焦点的话就可以,this.focus();
this.focus();
this.select()