JavaScript中$$$的含义是什么？已知$为jQuery别名求解答

Great question! Let's unpack this clearly:

• First off, there's no built-in $$$ selector in vanilla JavaScript or standard jQuery—this is definitely a custom function, most likely provided by the ChartIQ (CIQ) library you're using.
• The reason a single $ doesn't work here is probably one of two things:
  1. jQuery isn't loaded on your page at all, or it's been put into no-conflict mode (via jQuery.noConflict()), which removes the $ alias for jQuery.
  2. ChartIQ ships with its own lightweight DOM selector utility ($$$) to handle element selection without relying on jQuery. This ensures their chart engine works consistently even in environments where jQuery isn't present.
• To confirm this, pop open your browser's developer console and run console.log($$$)—you'll see it's a function that likely wraps native methods like document.querySelector() (since your examples with ID #idOfDev and class .classAppliedToDev match standard CSS selector syntax). A rough example of what its internal code might look like:

  const $$$ = (selector) => {
    const targetElement = document.querySelector(selector);
    // Probably adds some ChartIQ-specific handling here
    return targetElement;
  };
  

• This custom selector is designed to play nicely with CIQ.ChartEngine's container requirement, which is why it works seamlessly when you pass its result to the engine's configuration.

内容的提问来源于stack exchange，提问作者VivekDev