H5页面 遮罩层上弹窗滚动时禁止下层页面滚动的处理

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;
}

// 遮罩出来后让body不可滚动
$('body,html').addClass('notScroll');

//----------------------------

// 遮罩去掉之后body 可滚动
$('body,html').removeClass('notScroll');