如果子元素的''z-index与父元素相同，则子元素到达事件。或者父元素被禁用（无法点击）。

所以你可以尝试将window1的z-index设置为999999.

A child element is reach to an event if its'' z-index is the same as the parent one. Or the parent element is disabled(cannot click).
So you can try to set z-index of the "window1" to 999999.

document.getElementById('window1').style.zIndex = 999999;