bvaughn

React recently introduced an experimental profiler API. This page gives instructions on how to use this API in a production release of your app.

Table of Contents

• Profiling in production
  • Create React App
  • Webpack 4

Profiling in production

React DOM automatically supports profiling in development mode for v16.5+, but since profiling adds some small additional overhead it is opt-in for production mode. This gist explains how to opt-in.

wmayner

from IPython.display import Markdown, display

colors = ['#018700', '#00acc6', '#e6a500']

display(Markdown('<br>'.join(
    f'<span style="font-family: monospace">{color} <span style="color: {color}">████████</span></span>'
    for color in colors
)))

lilywang711

// 定义
export interface MyInputHandles {
  focus(): void;
}

const MyInput: RefForwardingComponent<MyInputHandles, MyInputProps> = (
  props,
  ref
) => {
  const inputRef = useRef<HTMLInputElement>(null);