这是在Extjs 中插入html 控件label！
 html: "<div><label id='howMany'>您共选中了</label><br/></div>"
获取label值：document.getElementById('howMany').innerText
赋值label值：document.getElementById('howMany').innerText = "这是赋值";
            document.getElementById('howMany').innerHTML

var westPanelForm = new Ext.form.FormPanel({

    id: 'westPanelForm',

    width: 200,

    region: 'west',

    border: false,

    height: 340,

    frame: true,

    layout: 'form',

    items: [

    {

        layout: 'column',

        items: [{

            layout: 'form', width: 260, items: [{

                baseCls: 'x-plain',

                border: false,

                height:30,

                html: "<div><label id='howMany'>您共选中了</label><br/></div>"

            }]

        }]

    }, {

        layout: 'column',

        items: [gridPanelMd]

    }

    ]

});