javascript – React动态呈现一定数量的组件

我想根据用户获得的点数(this.state.points)显示一些组件Star(material-ui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;

解决方法:

您可以使用Array.fill创建具有this.state.points空插槽数的新数组,然后使用< Star />填充这些插槽.组件如此：

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;

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

标签：javascript,reactjs,material-ui,state,icons
来源： https://codeday.me/bug/20190910/1800644.html