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  • 0522作业星座

       想一上午没想出来,老师讲了十几分钟搞定了,服了

      

    <body>
    <select id="xz">

    <option>白羊座</option>
    <option>金牛座</option>
    <option>双子座</option>
    <option>巨蟹座</option>
    <option>狮子座</option>
    <option>处女座</option>
    <option>天秤座</option>
    <option>天蝎座</option>
    <option>射手座</option>
    <option>摩羯座</option>
    <option>水瓶座</option>
    <option>双鱼座</option>

    </select>
    <select id="yr">

    <option class=" yr_opt">3.21-4.19</option>
    <option class=" yr_opt">4.20-5.20</option>
    <option class=" yr_opt">5.21-6.21</option>
    <option class=" yr_opt">6.22-7.22</option>
    <option class=" yr_opt">7.23-8.22</option>
    <option class=" yr_opt">8.23-9.22</option>
    <option class=" yr_opt">9.23-10.23</option>
    <option class=" yr_opt">10.24-11.22</option>
    <option class=" yr_opt">11.23-12.21</option>
    <option class=" yr_opt">12.22-1.19</option>
    <option class=" yr_opt">1.20-2.18</option>
    <option class=" yr_opt">2.19-3.20</option>

    </select>


    </body>
    </html>
    <script>
    var xz = document.getElementById("xz");
    var yr = document.getElementById("yr");
    var yr_opt = document.getElementsByClassName("yr_opt");
    xz.onchange = function () {
    var xz_slt = xz.selectedIndex;
    yr.options[xz_slt].selected = true;
    }



    </script>

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  • 原文地址:https://www.cnblogs.com/qwer123666/p/6894737.html
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