代码如下: /* 模态遮罩层单例对象 opacity:背景透明度 1. show() 2. close() */ Q.Overlay = function(opacity) { var self = this; self._createDiv = function() { if (self._overlay) return; self._overlay = $(“<div></div>”); var overlayCss = { ‘width’: ‘100%’, ‘min-height’: ‘100%’, ‘position’: ‘fixed’, ‘top’: 0, ‘left’: 0, ‘z