Ext4.2 window弹出

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点击按钮实现弹出核心：

var win = Ext.create("Ext.window.Window", {

                 title: "弹框",

                 id: "XXX",

                 autoShow: true,

                 modal: true,

                 constrainHeader: true,

                 resizable: false,

                 height: 500,

                 width: 850,

                 layout: "fit",

                 items: [],

                 listeners: {

                        afterrender: function() {}

                 }

               });

win.show();