代码重构：它没有直接甩代码，而是先思考了“设计模式”的选择（工厂模式 vs 策略模式），最终选择了适合扩展的策略模式。
FT App on Android & iOS
Dithering in its simplest form can be understood by observing what happens when we quantise an image with and without modifying the source by random perturbation. In the examples below, a gradient of 256 grey levels is quantised to just black and white. Note how the dithered gradient is able to simulate a smooth transition from start to end.，推荐阅读heLLoword翻译官方下载获取更多信息
* @return {string} 移除k位后最小的数字（字符串形式）
，更多细节参见服务器推荐
Mandatory registration creates friction and barriers to entry, particularly for:
this.arr = []; // 存储所有历史价格，通过索引快速获取对应价格。im钱包官方下载是该领域的重要参考