JQuery attr方法和removeAttr方法

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <style type="text/css">
        div{width:100px;margin:0px auto;border:1px solid red;}
    </style>
    <script src="../js/jquery-1.5.1.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $("#btnChange").click(function () {
                var $divs = $("div");
                //----1.举例1
                //$divs.eq(0).attr("MyAttr", "Ronaldo");   //eq返回指定下标的JQuery对象(注意:此时$divs中有两个div的dom元素)
                //$divs.eq(1).attr("MyAttr", "Ronaldo1");
                //alert($divs.attr("MyAttr"));             //读取MyAttr属性,注意,只会读取出第一个元素的该属性
                //----2.举例2    使用JSon格式设置attr
                //$divs.eq(0).attr({ "MyAttr": "Ronaldo", "Age": "19" });
                //$divs.eq(1).attr({ "MyAttr": "Rivaldo", "Age": "29" });
                //alert("MyAttr:" + $divs.eq(1).attr("MyAttr") + ",Age:" + $divs.eq(1).attr("Age"));
                //----3.举例3    移除属性
                $divs.eq(0).attr({ "MyAttr": "Ronaldo", "Age": "19" });
                $divs.eq(1).attr({ "MyAttr": "Rivaldo", "Age": "29" });
                alert("MyAttr:" + $divs.eq(1).attr("MyAttr") + ",Age:" + $divs.eq(1).attr("Age"));
                $divs.eq(1).removeAttr("Age");
                alert("MyAttr:" + $divs.eq(1).attr("MyAttr") + ",Age:" + $divs.eq(1).attr("Age"));
            });
        });
    </script>
</head>
<body>
    <input id="btnChange" type="button" value="Click Me" />
    <div id="div1">我是div1</div>
    <div id="div2">我是div2</div>
</body>
</html>

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