jquery字符串转dom对象及对该对象使用选择器查询

<script>    $(document).ready(function () {        var htmlStr = '<div id="outerDiv"><div class="class1"><a>aa</a></div><div class="class1"><span>bb</span></div><div>cc</div></div>'        var htmlObj = $(htmlStr); //将字符串转为jquery的dom对象        console.log(htmlObj.html());        var filterObj = htmlObj.find(".class1"); //对转换后的对象进行查询        console.log(filterObj);        alert($(filterObj[0]).html()); //<a>aa</a>        alert($(filterObj[1]).html()); //<span>bb</span>    }); </script>