Function featureTransform

src/leaflet/core/Transform.js:110–129

(feature, callback)

    return featureTransform(feature, _transformCoordinates);

    function featureTransform(feature, callback) {
        selfFeatures = feature;
        selfCallback = callback;
        //分离处理：
        if (feature.type === "Feature") {
            selfFeatures = _prepareFeatuers(feature);
        } else if (feature.type === "FeatureCollection") {
            let featureResults = [];
            for (let i = 0; i < feature.features.length; ++i) {
                try {
                    featureResults.push(_prepareFeatuers(feature.features[i]));
                } catch (err) {
                    featureResults = null;
                }
            }
            selfFeatures.features = featureResults;
        }

        return selfFeatures;
    }

    function _prepareFeatuers(feature) {
        const geometry = feature.geometry;