[jQuery] get text of a element, but without children text

[Jarod Liu]

<ul>
<li>
text1
    <ul>
        <li>text2</li>
    </ul>
</li>
</ul>

when i use $("ul li").text() i got a string containing both "text1"
and "text2", how can i just get the string "text1".  thanks in advance.