* @returns {number} - 当日价格的跨度
The web platform has incredible documentation compared to most tech platforms. However, most of it is written for JavaScript. If you don’t know JavaScript, you’ll have a much harder time understanding how to use most Web APIs.，更多细节参见heLLoword翻译官方下载
，这一点在Line官方版本下载中也有详细论述
Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.
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