百度地图开发：Label文本居中

//文本标签;
function addLabel(point, txt) {
    var opts = {
        position: point,
        offset: new BMap.Size(0, 20)//设置文本偏移量
    }
    var label = new BMap.Label(txt, opts); // 创建文本标注对象
    label.setStyle({
        color: "#FFF",
        fontSize: "10px",
        height: "24px",
        lineHeight: "20px",
        padding: "2px 5px",
        border: "1px solid rgba(230, 0, 0, 0.7)",
        background: "rgba(230, 0, 0, 0.7)",
        fontWeight: "bold",
        transform: 'translateX(-50%)',
        fontFamily: "微软雅黑"
    });
    map.addOverlay(label);
}

offset: new BMap.Size(0, 20)//设置文本偏移量