iPhone Safari下iframe不显示滚动条无法滚动的解决方法

在iframe外层包一层div，添加如下样式：
style="-webkit-overflow-scrolling:touch;overflow:auto;"

@media only screen and (-webkit-min-device-pixel-ratio : 1.5),only screen and (min-device-pixel-ratio : 1.5){
.content-wrapper{-webkit-overflow-scrolling:touch;overflow:auto!important;}
}