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jQuery检查复选框是否被选

<!DOCTYPE html><html><head>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <title>检查复选框是否被选</title>    <meta charset="utf-8" />    <script src="http://www.mamicode.com/Scripts/jquery-1.12.4.js"></script></head><body>    <form>        <input type="checkbox" id="cr" name="cr" />        <input type="checkbox" id="cr2" name="cr2" checked="checked" />    </form>    <script>        var $cr = $("#cr");//jquery对象        var cr = $cr[0];   //dom对象        var $cr2 = $("#cr2");        var cr2 = $cr2[0];        alert($cr.checked); //undefined        alert(cr.checked);//false        alert(cr2.checked);//true    </script></body></html>

  

jQuery检查复选框是否被选