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var reLoadLeftTime = false ;
//监听浏览器当前页面是否被激活的事件
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]){ 
    reLoadLeftTime = true;
    // currentPeriod();
    }
}
document.addEventListener(visibilityChangeEvent, onVisibilityChange);




本文标签: 后台浏览器手机