JQuery uses attr method to implement drop-down list selection_jquery

The html code is as follows:

<select id="category" name="category">
<option value="">请选择类别</option>
<option value="1">类别1</option>
<option value="2">类别2</option>
<option value="3">类别3</option>
<option value="4">类别4</option>
</select>

js code:

<script type="text/javascript">
$('#category option[value=3]').attr('selected',true);
</script>