Mobile Upload unknown image size, JS set width and height ratio

<style rel= "stylesheet" type= "Text/css" >

. lunboimg{width:100%; height:auto; float:left;}
. lunboimg img{width:100%; float:left;}

</style>

$ (function () {
var evt = "onorientationchange" in window? "Orientationchange": "Resize";
Window.addeventlistener (evt, function () {
Location.reload ()
}, False); When the screen is rotated, refresh the page, (prevent the image from getting the width fixed, the picture cannot be adapted)

var width =$ (window). width (); Get the width and height of your phone browser
var height=$ (window). Height ();
height=width*0.5; Picture height = 0.2 aspect ratio of picture width: 2:1
$ ("#banner"). CSS ({"width": width, "height": height}); Get the scaled size
});

<div class= "Lunboimg" >

</div>

Mobile Upload unknown image size, JS set width and height ratio