主题：js 怎么监控键盘是否弹出

js 怎么监控键盘是否弹出，想实现：1键盘弹出执行一个事件，2.键盘隐藏后执行一个事件

参考代码，自己写成js函数调用

Select Case e.Path
    Case "test.htm",""
        Dim wb As New weui
        wb.AddForm("","form1","test.htm")
        With wb.AddInputGroup("form1","ipg1","基本资料")
            .AddInput("xm","姓名","text")
            .AddInput("nl","年龄","number")
            .AddInput("rq","日期","date")
            .AddSwitch("vip","VIP客户")
        End With
        With wb.AddInputGroup("form1","ipg2","备注")
            .AddTextArea("bz",5).Placeholder = "请输入200字以内的备注"
        End With
        With wb.AddButtonGroup("form1","btg1",True)
            .Add("btn1", "确定", "button").Attribute = ""
        End With
        wb.AppendHTML("<script>var height = document.body.clientHeight;window.addEventListener('resize', function () {var cheight = document.body.clientHeight; if(height == cheight) {bz.value='键盘收起了'}else{bz.value='键盘弹起了'};});</script>")
        e.WriteString(wb.Build) '生成网页
End Select