监听是否离开当前页面

var  pageVisibility = document.visibilityState;
// 监听 visibility change 事件 
document.addEventListener('visibilitychange', function () {
    if (document.visibilityState == 'hidden') {
        // 页面变为不可见时触发 
        $(".musicBg_close").show();
        $(".musicBg_on").hide();
        audio.pause();
    }else{
        // 页面变为可见时触发 
    }
});

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转载自blog.csdn.net/wcy7916/article/details/85125787