BI.createWidget({
    type: "bi.center",
    element: "#wrapper",
    items: [{
        type: "bi.label",
        text: "Center 1，这里虽然设置label的高度30，但是最终影响高度的是center布局",
        cls: "layout-bg1",
        whiteSpace: "normal"
    },{
        type: "bi.label",
        text: "Center 2，为了演示label是占满整个的，用了一个whiteSpace:normal",
        cls: "layout-bg2",
        whiteSpace: "normal"
    }],
    hgap: 20,
    vgap: 20
});