This \u001b character is the special character that starts off most Ansi escapes; most languages allow this syntax for representing special characters, e.g. Java, Python and Javascript all allow the \u001b syntax.
功能特性：支持多源异构与复杂网络环境
。体育直播对此有专业解读
for (const component of components) {
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Introduction to events: event propagation — MDN Web Docs