遮罩层可滚动

1.解决方法

给弹层加个高度height:100%;然后overflow-y:auto;

.choseareaWrap {
position: fixed;
top: 0;
100%;
height:100%;
overflow:auto;
z-index:9999;
background: url('../../../image/angent/sbg.png') repeat;
color:#fff;
/*display:none;*/
max-640px;
overflow-y:scroll;
}