尝试以下操作:

<select onchange="location = this.options[this.selectedIndex].value;">
    <option>Please select</option>
    <option value="http://www.apple.com/">Apple</option>
    <option value="http://www.bbc.com">BBC</option>
    <option value="http://www.facebook.com">Facebook</option>
</select>​

您要查找的是onchange"而不是onsubmit"

What you were looking for was 'onchange' instead of 'onsubmit'