attr('selected','selected') not work in jquery
<pre><code>$('#sellist option').each(function(index) {
    var str ='4/5/8';
    var substr = str.split('/');
    if (substr[0] == $(this).attr('value')) {
        $(this).attr('selected','selected');
        alert('hi'); ///For check
    }
});
</code></pre>

<p>Every thing works fine and <code>alert</code> is fired. I havent any error in console. But <code>#sellist option</code> is not selected which I want. What is my problem. Thanks.</p>
