<div id="scroll" class="scroll">    <div id="modal-body" class="modal-body">內容</div> </div>.scroll {      position: relative;      line-height: 1.6;      height: 5rem;     }    .modal-body {      line-height: 1.6;      padding: 10px 0;      font-size: 120%;      overflow-y: scroll;      -webkit-overflow-scrolling: touch;     }$("#rule").on("click", function () {       $(".modal").show();      if (!haveScroll) {        new IScroll("#scroll", {          mouseWheel: true,          scrollY: true,          tap: true         });         haveScroll = true;       }     });安卓沒問題可以滑動，可是IOS滑不動，請問是怎么回事呀，求指導