// 原因：先处理右侧元素（含循环部分），把结果存在栈里，供左侧元素直接使用
for (let i = 2 * len - 1; i = 0; i--) {
，更多细节参见WPS下载最新地址
Triangulated Irregular Network
They've even dealt with a blood clot in the neck, treating it with injections of a blood-thinning drug and later oral medicine, once it arrived on a cargo resupply ship.