H5页面 遮罩层上弹窗滚动时禁止下层页面滚动的处理

css的处理:

html, body {
    height: 100%;
}
body{
    position: relative;
}
/*遮罩层显示时body的样式*/
.notScroll {
    overflow: hidden;
}
/*遮罩层*/
.window_mask {
    position: fixed;
    top: 0 !important;
}
/*弹窗*/
.window_boundingBox {
    position: fixed !important;
    top: 50% !important;
    margin-top: -214px !important;
    z-index: 1001;
    width: 90%;
    left: 5%;
    background-color: rgb(232, 232, 232);
    border-radius: 3px;
    overflow: hidden;
}
/*弹窗中需要滚动的部分*/
.window_boundingBox .window_body {
    overflow: auto;
    webkit-overflow-scrolling: touch;
    line-height: 28px;
    font-size: 16px;
    padding: 5px 10px;
    height: 242px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}html, body {
    height: 100%;
}
body