The pop-up window is initially in a hidden state.When an element has focus and causes a popup to appear, the element does not lose focus. Because of this, an onblur event associated with an element that creates a popup will not occur when the popup is displayed. pop-up window 只能显示一个的,不能同时显示两个,当pop-up window 失去焦点的时候不会显示的
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