focus() 方法用于赋予文本域焦点。
textObject.focus()
下面的例子可设置和移开文本域上的焦点:
<html> <head> <script type="text/javascript"> function setFocus() {document.getElementById('text1').focus()
} function loseFocus() {document.getElementById('text1').blur()
} </script> </head> <body> <form> <input type="text" id="text1" /> <br /> <input type="button" onclick="setFocus()" value="Set focus" /> <input type="button" onclick="loseFocus()" value="Lose focus" /> </form> </body> </html>