一. NavLink 理解

1. NavLink 可以实现路由的高亮，通过 activeClassName 属性指定样式名（应避免使用 active)。
2. 标签体内容是一个特殊的标签属性。
3. 通过 this.props.children 可以获取标签体内容。

二. NavLink 使用

import React, { Component } from "react";
import { Route, NavLink } from "react-router-dom";
import Home from "./pages/Home";
import About from "./pages/About";
import "./app.css";
export default class App extends Component {
  render() {
    return (
      <div className="wrap">
        <div className="left">
          {/* 路由跳转 */}
          <ul>
            <li>
              <NavLink
                className="link_item"
                activeClassName="link_active"
                to="home"
              >
                Home
              </NavLink>
            </li>
            <li>
              <NavLink
                className="link_item"
                activeClassName="link_active"
                to="about"
              >
                About
              </NavLink>
            </li>
          </ul>
        </div>
        <div className="right">
          {/* 注册路由 */}
          <Route path="/about" component={About} />
          <Route path="/home" component={Home} />
        </div>
      </div>
    );
  }
}
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app.css

.wrap {
  width: 100%;
  height: 100%;
  display: flex;
}
.left {
  width: 200px;
  height: 100%;
  border-right: 1px solid #bbb;
  box-sizing: border-box;
}
ul {
  list-style: none;
}
li {
  width: 100%;
  height: 40px;
  line-height: 40px;
  border-bottom: 1px solid #bbb;
}
.link_item {
  width: 100%;
  height: 100%;
  display: block;
}
.link_active {
  color: red !important;
  background-color: aquamarine !important;
}
.right {
  width: calc(100% - 200px);
}

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三. NavLink 封装使用

import React, { Component } from "react";
import { Route } from "react-router-dom";
import Home from "./pages/Home";
import About from "./pages/About";
import MyNavLink from "./components/MyNavLink";
import "./app.css";
export default class App extends Component {
  render() {
    return (
      /**
       * 也可使用 activeClassName(string) class类名 设置样式
       */
      <div style={{ width: "100%", height: "100%", display: "flex" }}>
        <div
          style={{
            width: "200px",
            height: "100%",
            borderRight: "1px solid",
            boxSizing: "border-box",
          }}
        >
          {/* 路由跳转 */}
          <ul style={{ listStyle: "none" }}>
            <li
              style={{
                width: "100%",
                height: "40px",
                lineHeight: "40px",
                borderBottom: "1px solid #bbb",
              }}
            >
              <MyNavLink to="home">Home</MyNavLink>
            </li>
            <li
              style={{
                width: "100%",
                height: "40px",
                lineHeight: "40px",
                borderBottom: "1px solid #bbb",
              }}
            >
              <MyNavLink to="about">About</MyNavLink>
            </li>
          </ul>
        </div>
        <div style={{ width: "calc(100% - 200px)", height: "100%" }}>
          {/* 注册路由 */}
          <Route path="/about" component={About} />
          <Route path="/home" component={Home} />
        </div>
      </div>
    );
  }
}
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MyNavLink

import React, { Component } from "react";
import { NavLink } from "react-router-dom";

export default class MyNavLink extends Component {
  render() {
    console.log(this.props);
    return (
      /**
       * 也可使用 activeStyle(class类) 设置样式
       * activeClassName(string)：设置 高亮class类名，默认值为active
       * activeStyle(object)：设置 高亮style样式
       */
      <NavLink
        activeStyle={{
          color: "#fff",
          background: "#03a9f4",
        }}
        style={{
          width: "100%",
          height: "100%",
          display: "block",
        }}
        {...this.props}
      />
    );
  }
}
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