H5新特性监听手机的返回键

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);

这段代码的原理我个人理解就是通过判断用户浏览的是否为当前页，从而进行相关操作。