#鸿蒙通关秘籍# 如何在鸿蒙中实现一次开发，多端部署的应用架构？

class DataManager {
    private static instance: DataManager;

    private constructor() {}

    public static getInstance(): DataManager {
        if (!this.instance) {
            this.instance = new DataManager();
        }
        return this.instance;
    }

    public fetchData(url: string): Promise<any> {
        return fetch(url).then(response => response.json());
    }
}
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