@wayz/react-gl/esm/utils/sortLayersByzIndex.js

React Component for DeckGL, Base on AMap, Mapbox GL

export function sortLayersByzIndex(a, b) {
    if (a.props.zIndex === undefined && b.props.zIndex === undefined) {
        return -1;
    }
    if (a.props.zIndex === undefined && b.props.zIndex !== undefined) {
        return -1;
    }
    if (a.props.zIndex !== undefined && b.props.zIndex === undefined) {
        return 1;
    }
    if (a.props.zIndex < b.props.zIndex) {
        // 按某种排序标准进行比较, a 小于 b
        return -1;
    }
    if (a.props.zIndex > b.props.zIndex) {
        return 1;
    }
    // a must be equal to b
    return 0;
}