弹窗
.ivu-modal-mask { position: fixed; top: 0; bottom: 0; left: 0; right: 0; background-color: rgba(55,55,55,.6); height: 100%; z-index: 1000; }
.ivu-modal-wrap {
position: fixed;
overflow:
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index:1000;
-webkit-overflow-scrolling: touch;
outline: