优点： 梯度连续，优化更稳定。
title = self._extract_text(soup.select_one("h1")) or \
，更多细节参见爱思助手下载最新版本
WebAssembly has come a long way since its first release in 2017. The first version of WebAssembly was already a great fit for low-level languages like C and C++, and immediately enabled many new kinds of applications to efficiently target the web.
But YouTube remains the biggest disruptor