媒体查询iphone6、iphone6 plus，js判断设备型号

/* 兼容问题*/
@media screen and (device- 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 2){
.dialog-agreement-con{
height: 45%;/* iphone4*/
}
}
@media screen and (device- 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2){
.dialog-agreement-con{
height: 55%;/* iphone5*/
}
}
@media only screen and (min-device- 375px) and (max-device- 667px) and (orientation : portrait) {
.dialog-agreement-con{
height: 60%;/* iphone6竖屏*/
}
}
@media only screen and (min-device- 414px) and (max-device- 736px) and (orientation : portrait) {
.dialog-agreement-con{
height: 60%;/* iphone6 plus竖屏*/
}
}
.dialog-agreement-con{
overflow-y:scroll;
margin-bottom: 2rem;
}

CSS判断横屏竖屏
@media screen and (orientation: portrait) {
/*竖屏 css*/
}
@media screen and (orientation: landscape) {
/*横屏 css*/
}

JS判断横屏竖屏
//判断手机横竖屏状态：
window.addEventListener("onorientationchange" in window ? "orientationchange" : "resize", function() {
if (window.orientation === 180 || window.orientation === 0) {
alert('竖屏状态！');
}
if (window.orientation === 90 || window.orientation === -90 ){
alert('横屏状态！');
}
}, false);
//移动端的浏览器一般都支持window.orientation这个参数，通过这个参数可以判断出手机是处在横屏还是竖屏状态。

// 横屏监听
var updateOrientation = function(){
if(window.orientation=='-90' || window.orientation=='90'){
$('.landscape-wrap').removeClass('hide');
console.log('为了更好的体验，请将手机/平板竖过来！');
}else{
$('.landscape-wrap').addClass('hide');
console.log('竖屏状态');
}
};
window.onorientationchange = updateOrientation;