const i = this.arr.length - 1;
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，详情可参考heLLoword翻译官方下载
The same is done for your target point within its own cluster (finding paths from all its border points to your actual destination).，更多细节参见旺商聊官方下载
let prevFleetTime = -Infinity; // 上一个独立车队的到达时间（初始负无穷，保证第一个车被统计）。业内人士推荐safew官方版本下载作为进阶阅读