javascript - React - 动态渲染一定数量的组件

Question

我想根据用户获得的点数 (this.state.points) 显示一些组件星标(MUI 组件)。

我不知道该怎么做。

import React, { Component } from "react";
import { Star } from "@material-ui/icons";

Points extends Component {
  constructor(props) {
  super(props);
    this.state = {
      points: 6
    };
  }

  render() {
     return (
       <div>
         <p>
           + {this.state.points} points
           <Star />
         </p>
       </div>
     );
    }
  }

export default Points;

Answer 1

您可以使用 Array.fill 用 this.state.points 创建新数组然后用 <Star /> 填充的空槽数像这样的组件:

import React, { Component } from "react";
import { Star } from "@material-ui/icons";

class Points extends Component {
  constructor(props) {
    super(props);
    this.state = {
      points: 6
    };
  }

  render() {
    return (
      <div>
        <p>
          + {this.state.points} points
          // This is where the magic happens
          {Array(this.state.points).fill(<Star />)}
        </p>
      </div>
    );
  }
}

export default Points;

这是一个工作沙箱:https://codesandbox.io/s/vj3xpyn0x0