In a single document the main menu to add "calculator" option, to achieve click on the "calculator" option pop-up modal dialog box, and in this dialog box to achieve an integer calculator functions.
说明：在单文档主菜单中增加“计算器”选项，实现点击“计算器”选项时弹出模态对话框，并在此对话框中实现整数计算器的功能。
In a single document the main menu to add "calculator" option, to achieve click on the "calculator" option pop-up modal dialog box, and in this dialog box to achieve an integer calculator functions.
说明：在单文档主菜单中增加“计算器”选项，实现点击“计算器”选项时弹出模态对话框，并在此对话框中实现整数计算器的功能。
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