JS 判断浏览器窗口是否处于当前激活状态

Posted by 任平生 on March 12, 2012

项目中有个定时器,希望在浏览器窗口处于激活状态时运行,而非激活状态则停止。代码如下:

timer = setInterval(adds,800);  
  
function onBlur(){  
	clearInterval(timer);  
}  
function onFocus(){  
	clearInterval(timer);  
	timer = setInterval(adds,800);  
}  
  
// 判断浏览器窗口是否处于激活状态  
if(/*@[email protected]*/false){  //对于 IE 要专门开小灶  
	document.onfocusin = onFocus;  
	document.onfocusout = onBlur;  
}else{  
	window.onfocus = onFocus;  
	window.onblur = onBlur;  
}  

如果使用 jquery 的话,可以用代码:

$(window).blur(function(){  
	onBlur();  
});  
$(window).focus(function(){  
	onFocus();  
});  

不过 ie7,ie6 无效。

via: http://stackoverflow.com/questions/1060008/is-there-a-way-to-detect-if-a-browser-window-is-not-currently-active