监听浏览器当前页面是否被激活的事件
this.hiddenProperty = "hidden" in document ? "hidden" : "webkitHidden" in document ? "webkitHidden" : "mozHidden" in document ? "mozHidden" : null; var visibilityChangeEvent = this.hiddenProperty.replace( /hidden/i, "visibilitychange" ); document.addEventListener(visibilityChangeEvent, this.onVisibilityChange);
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