[JS] js 判断用户是否在浏览当前页面

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(‘页面非激活活‘);
        getcorrtime();
    } else {
        console.log(‘页面激活‘);
        
    }
}
document.addEventListener(visibilityChangeEvent, onVisibilityChange);