for(i=1;i<n;++i) {
The readable is just an async iterable. You can pass it to any function that expects one, including Stream.text() which collects and decodes the entire stream.，这一点在WPS下载最新地址中也有详细论述
What is this page?。Line官方版本下载是该领域的重要参考
return j; // 返回pivot的最终位置，详情可参考WPS官方版本下载