js测试题

<div class="test">

        <h2>测试题</h2>

        <div clss="test_select">

            <div class="test_cont test_on">

                <h3><span>1/5</span>测试题目11111111111</h3>

                <p><span></span><input type="radio" name="xuanxiang1" value="1">天气晴</p>

                <p><span></span><input type="radio" name="xuanxiang1" value="2">天气多云</p>

                <p><span></span><input type="radio" name="xuanxiang1" value="3">天气阴</p>

                <p><span></span><input type="radio" name="xuanxiang1" value="4">下雨</p>

            </div>

            <div class="test_cont">

                <h3><span>2/5</span>测试题目22222222222</h3>

                <p><span></span><input type="radio" name="xuanxiang2" value="1">天气晴</p>

                <p><span></span><input type="radio" name="xuanxiang2" value="2">天气多云</p>

                <p><span></span><input type="radio" name="xuanxiang2" value="3">天气阴</p>

                <p><span></span><input type="radio" name="xuanxiang2" value="4">下雨</p>

            </div>

            <div class="test_cont">

                <h3><span>3/5</span>测试题目3333333333</h3>

                <p><span></span><input type="radio" name="xuanxiang3" value="1">天气晴</p>

                <p><span></span><input type="radio" name="xuanxiang3" value="2">天气多云</p>

                <p><span></span><input type="radio" name="xuanxiang3" value="3">天气阴</p>

                <p><span></span><input type="radio" name="xuanxiang3" value="4">下雨</p>

            </div>

            <div class="test_cont">

                <h3><span>4/5</span>测试题目44444444444</h3>

                <p><span></span><input type="radio" name="xuanxiang4" value="1">天气晴</p>

                <p><span></span><input type="radio" name="xuanxiang4" value="2">天气多云</p>

                <p><span></span><input type="radio" name="xuanxiang4" value="3">天气阴</p>

                <p><span></span><input type="radio" name="xuanxiang4" value="4">下雨</p>

            </div>

            <div class="test_cont">

                <h3><span>5/5</span>测试题目55555555555</h3>

                <p><span></span><input type="radio" name="xuanxiang5" value="1">天气晴</p>

                <p><span></span><input type="radio" name="xuanxiang5" value="2">天气多云</p>

                <p><span></span><input type="radio" name="xuanxiang5" value="3">天气阴</p>

                <p><span></span><input type="radio" name="xuanxiang5" value="4">下雨</p>

            </div>

        </div>

        <div class="result">您当前的得分是<span></span></div>

    </div>

    <script>

        $(function () {

            var sum = 0;

            var i = 0;

            var len = parseInt($(".test_cont").length);

            $(".test_cont p").click(function () {

                $(this).find("input").attr("checked", "checked")

                var b = parseInt($(this).find("input").val());

                $(this).parent().hide().next().fadeIn(100);

                sum += b;

                i++;

                if (i >= len) {

                    console.log($(".result"));

                    $(".result").show();

                    $(".result span").html(sum + '分');

                }

            });

        })

    </script>