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react-antd

第 2 章

typescript 究竟是什么

  • JavaScript that scales
  • 静态类型风格的类型系统
  • 从 es6 到 es10 甚至是 esnext 的语法支持
  • 兼容各种浏览器,各种系统,各种服务器,完全开源

为什么要用 typescript

  • 程序更容易理解
    • 问题:函数或者方法输入输出的参数类型,外部条件等
    • 动态语言的约束:需要手动调试等过程
  • 效率更高
    • 在不通的代码块和定义中进行跳转
    • 代码自动补全
    • 丰富的接口提示
  • 更少的错误
    • 编译期间能够发现大部分错误
    • 杜绝一些比较常见错误
  • 非常好的包容性
    • 完全兼容 JavaScript
    • 第三方库可以单独编写类型文件
    • 流行的项目都支持 typescript
  • 一点小缺点
    • 增加了一些学习成本
    • 短期内增加了一些开发成本

Interface 接口

  • 对 对象的形状 (shape) 进行描述
  • 对类 (class) 进行抽象
  • Duck Typing (鸭子类型)
    • 如果它像鸭子那样的叫、走路,那就可以看作是鸭子
    • 接口更关注对象如何被使用,而不是对象的类型是什么

class 类

  • 类 (Class):定义了一切事物的抽象特点
  • 对象 (Object):类的实例
  • 面向对象 (OOP) 三大特性:封装、继承、多态

Generics

function echo<T>(arg: T): T {
  return arg;
}
const result = echo(true);
function swap<T, U>(tuple: [T: U]): [U: T] {
  return [tuple[1], tuple[0]];
}
const result2= swap(['str', 123])
  • 泛型的约束
    • 有这么一个需求:
    • 传入的参数必须得有 length 这个属性
interface IWithLength {
  length: number
}
function echowithLenght<T extends IWithLength>(arg: T): T {
  console.log(arg.length)
  return arg
}
  • 泛型类和接口
class Queue<T> {
  private data = [];

  push(item: T) {
    return this.data.push(item);
  }

  pop(): T {
    return this.data.shift();
  }
}

const queue = new Queue<number>();
queue.push(1);
// queue.push('str');
console.log(queue.pop().toFixed());
// --------
interface KeyPair<T, U> {
  key: T;
  value: U;
}
let key1: KeyPair<number, string> = {key: 1, value: "str"}
  • 泛型修饰函数
interface IPlus<T> {
  (a: T, b: T): T;
}

function plus(a: number, b: number): number {
  return a + b;
}

function connect(a: string, b: string): string {
  return a + b;
}

const a: IPlus<number> = plus;
const b: IPlus<String> = connect;

第 4 章

创建自己组件库的色彩体系

  • 系统色板- 基础色板 + 中性色板
  • 产品色板 - 品牌色 + 功能色板

组件库样式变量分类

  • 基础色彩系统
  • 字体系统
  • 表单
  • 按钮
  • 边框和阴影
  • 可选配置开关

Button 组件

.btn {
  position: relative;
  display: inline-block;
  font-weight: $btn-font-weight;
  line-height: $btn-line-height;
  color: $body-color;
  white-space: nowrap;
  text-align: center;
  vertical-align: middle;
  background-image: none;
  border: $btn-border-width solid transparent;
  @include button-size($btn-padding-y, $btn-padding-x, $btn-font-size, $border-radius);
  box-shadow: $btn-box-shadow;
  cursor: pointer;
  transition: $btn-transition;
  &.disabled,
  &[disabled] {
    cursor: not-allowed;
    opacity: $btn-disabled-opacity;
    box-shadow: none;
    > * {
      pointer-events: none;
    }
  }
}
  • 支持原生 DOM 属性
    • 拿到所有原生 button 属性 React.ButtonHTMLAttributes<HTMLElement>
    • 如果合并两个类型的属性呢? Intersection Types 交叉类型,用 & 表示
    • 联合类型 |,仅能返回 ab 其中一个
  • Partial<T & U> 所有属性都变为可选属性
type NativeButtonProps = React.ButtonHTMLAttributes<HTMLElement>;
type AnchorButtonProps = BaseButtonProps & React.AnchorHTMLAttributes<HTMLElement>;
export type ButtonProps = Partial<NativeButtonProps & AnchorButtonProps>;

第 5 章

// 最简单的测试
test('first react test case', () => {
  const wrapper = render(<Button>OK</Button>);
  const element = wrapper.queryByText('OK');
  expect(element).toBeTruthy();
});

第 6 章

  • 如果多处都要用某个类型,那就来个类型别名吧.
type SelectCallback = (selectedIndex: number) => void;
  • 解决 “爷父子孙” 嵌套组件状态、属性、回调传递和共享
interface IMenuContent {
  index: number;
  onSelect?: SelectCallback;
}

export const MenuContext = createContext < IMenuContent > { index: 0 };

const Menu: React.FC<MenuProps> = (props) => {
  const passedContext: IMenuContent = {
    index: currentIndex ? currentIndex : 0,
    onSelect: handleClick,
  };

  return (
    <ul className={classes} style={style}>
      <MenuContext.Provider value={passedContext}>{children}</MenuContext.Provider>
    </ul>
  );
};

// ---- 曾孙组件 ----
import { MenuContext } from './menu';

const MenuItem: React.FC<MenuItemProps> = (props) => {
  const context = useContext(MenuContext);
};
  • React.Children.mapReact.cloneElement 的应用
    • 可以解决必填子组件 index 的问题
const renderChildren = () => {
    return React.Children.map(children, (child, index) => {
      const childElement = child as React.FunctionComponentElement<MenuItemProps>;
      const { displayName } = childElement.type;
      if (displayName === 'MenuItem') {
        return React.cloneElement(childElement, { index });
      } else {
        console.error('Warning: Menu has a child which is not a MenuItem component');
      }
    });
  };
  • CSS 选择器 :scope 匹配当前元素所在容器
  • 精髓
const SubMenu: React.FC<SubMenuProps> = ({ index, title, children, className }) => {
  const context = useContext(MenuContext);
  const openedSubMenus = context.defaultOpenSubMenus as Array<string>;
  const isOpened = (index && context.mode === 'vertical') ? openedSubMenus.includes(index): false;
  const [menuOpen, setOpen] = useState(isOpened);
  const classes = classNames('menu-item submenu-item', className, {
    'is-active': context.index === index,
  });

  const handleClick = (e: React.MouseEvent) => {
    e.preventDefault();
    setOpen(!menuOpen);
  }

  let timer: any;
  const handleMouse = (e: React.MouseEvent, toggle: boolean) => {
    clearTimeout(timer);
    e.preventDefault();
    timer = setTimeout(() => {
      setOpen(toggle);
    }, 300);
  }

  const clickEvents = context.mode === 'vertical' ? {
    onClick: handleClick
  } : {}

  const hoverEvents = context.mode !== 'vertical' ? {
    onMouseEnter: (e: React.MouseEvent) => { handleMouse(e, true)},
    onMouseLeave: (e: React.MouseEvent) => { handleMouse(e, false)}
  } : {}

  const renderChildren = () => {
    const subMenuClasses = classNames('menu-submenu', {
      'menu-opened': menuOpen
    })
    const childComponent = React.Children.map(children, (child, i) => {
      const childElement = child as FunctionComponentElement<MenuItemProps>;
      if (childElement.type.displayName === 'MenuItem') {
        return React.cloneElement(childElement, {
          index: `${index}-${i}`
        });
      } else {
        console.error('Warning: Menu has a child which is not a MenuItem component');
      }
    });
    return <ul className={subMenuClasses}>{childComponent}</ul>;
  };

  return (
    <li key={index} className={classes} {...hoverEvents}>
      <div className="submenu-title" {...clickEvents}>{title}</div>
      {renderChildren()}
    </li>
  );
};

第 7 章

  • SCSS精髓
// -------- _mixin.scss
$theme-colors:
(
  "primary":    $primary,
  "secondary":  $secondary,
  "success":    $success,
  "info":       $info,
  "warning":    $warning,
  "danger":     $danger,
  "light":      $light,
  "dark":       $dark
);

@each $key, $val in $theme-colors {
  .icon-#{$key} {
    color: $val;
  }
}

封装自己的动画组件

  1. 使用mixin封装css
@mixin zoom-animation(
  $direction: 'top',
  $scaleStart: scaleY(0),
  $scaleEnd: scaleY(1),
  $origin: center top,
) {
  .zoom-in-#{$direction}-enter {
    opacity: 0;
    transform: $scaleStart;
  }
  .zoom-in-#{$direction}-enter-active {
    opacity: 1;
    transform: $scaleEnd;
    transition: transform 300ms cubic-bezier(0.23, 1, 0.32, 1) 100ms, opacity 300ms cubic-bezier(0.23, 1, 0.32, 1) 100ms;
    transform-origin: $origin
  }
  .zoom-in-#{$direction}-exit {
    opacity: 1;
  }
  .zoom-in-#{$direction}-exit-active {
    opacity: 0;
    transform: $scaleStart;
    transition: transform 300ms cubic-bezier(0.23, 1, 0.32, 1) 100ms, opacity 300ms cubic-bezier(0.23, 1, 0.32, 1) 100ms;
    transform-origin: $origin;
  }
}

@mixin border-right-radius($raduis) {
  border-top-right-radius: $raduis;
  border-bottom-right-radius: $raduis;
}

@mixin border-left-radius($raduis) {
  border-top-left-radius: $raduis;
  border-bottom-left-radius: $raduis;
}


// -------- _animation.scss
@include zoom-animation('top', scaleY(0), scaleY(1), center top);
@include zoom-animation('left', scale(0.45, 0.45), scale(1, 1), top left);
@include zoom-animation('right', scale(0.45, 0.45), scale(1, 1), top right);
@include zoom-animation('top', scaleY(0), scaleY(1), center bottom);

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