cesium label文字左对齐

要让Cesium Label的文字左对齐，可以使用CSS的text-align属性来实现。具体做法如下：

1. 在创建Label时，设置其style属性，添加text-align:left样式，例如：

var label = new Cesium.LabelGraphics({
    text: 'This is a left-aligned label',
    style: new Cesium.LabelStyle({
        font: '14px Helvetica',
        textFill: Cesium.Color.WHITE,
        backgroundColor: Cesium.Color.BLUE,
        backgroundPadding: new Cesium.Cartesian2(7, 5),
        textOutlineWidth: 2,
        textOutlineColor: Cesium.Color.BLACK,
        verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
        horizontalOrigin: Cesium.HorizontalOrigin.LEFT,
        pixelOffset: new Cesium.Cartesian2(10, -20),
        eyeOffset: new Cesium.Cartesian3(0.0, 0.0, -100.0),
        scaleByDistance: new Cesium.NearFarScalar(1.5e2, 1.0, 1.5e7, 0.1),
        translucencyByDistance: new Cesium.NearFarScalar(1.5e2, 1.0, 1.5e7, 0.0),
        pixelOffsetScaleByDistance: new Cesium.NearFarScalar(1.5e2, 1.0, 1.5e7, 0.0)
    }),
    show: true,
    position: Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883, 0.0)
});

label.style.textAlign = 'left';

2. 如果已经创建了Label，可以通过获取其对应的DOM元素，然后设置其style属性来实现左对齐，例如：

var label = viewer.entities.add({
    label: {
        text: 'This is a center-aligned label',
        font: '14px Helvetica',
        fillColor: Cesium.Color.WHITE,
        backgroundColor: Cesium.Color.BLUE,
        backgroundPadding: new Cesium.Cartesian2(7, 5),
        outlineWidth: 2,
        outlineColor: Cesium.Color.BLACK,
        verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
        horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
        pixelOffset: new Cesium.Cartesian2(0, -20),
        position: Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883, 0.0),
        show: true
    }
});

var labelElement = label._labelRenderer._element;
labelElement.style.textAlign = 'left';