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<form action="insert.php" onsubmit="return onSubmit()">
    <input type="text" name="title" id="title" />
</form>

<script type="text/javascript">
    function onSubmit()
    {
        if ( $("#title").val(); == "" ) {
            alert("请输入标题");
            return false;
        }

        return true;
    }
</script>