使用 h5 新特性，轻松监听任何 App 自带返回键

 
var
 hiddenProperty = 
'hidden'
 
in
 document ? 
'hidden'
 :    

        
'webkitHidden'
 
in
 document ? 
'webkitHidden'
 :    

        
'mozHidden'
 
in
 document ? 
'mozHidden'
 :    

        
null
;

    
var
 visibilityChangeEvent = hiddenProperty.replace(
/hidden/
i, 
'visibilitychange'
);

    
var
 onVisibilityChange = 
function
(){

        
if
 (document[hiddenProperty]) {    

            console.log(
'页面非激活'
);

        }
else
{

            console.log(
'页面激活'
)

        }

    }

    document.addEventListener(visibilityChangeEvent, onVisibilityChange);