'recipe' 映射数组时未定义

Question

我目前正在尝试显示我的信息瓶 API，它正在返回 json 数据。

当运行以下代码时我得到错误：

Line 37:61: 'recipe' is not defined no-undef
Line 41:24: 'recipe' is not defined no-undef
Line 42:24: 'recipe' is not defined no-undef

这是它获取的数据： https://pastebin.com/uYUuRY6U

代码如下：

import React, { Component } from 'react';
import Axios from 'axios';
import NavBar from '../header-footer/nav-bar'
import Featured from './FeaturedMealplan'

export default class MealPlanDetail extends Component {
  constructor(props) {
      super(props);

      this.state = {
          currentId: this.props.match.params.slug,
          mealplanItem: {}, // Full mealplan
          mealplanRecipes: [], // Contains recipe names and difficulty.
          mealplanIngredients: [], // Ingredents of the recipe
      }
  }

  getMealplanItem() {
    Axios.get(`http://localhost:5000/get-mealplan/${this.state.currentId}`
    ).then(response => {
        // console.log("response", response)
        this.setState({
            mealplanItem: response.data.mealplan,
            mealplanRecipes: this.state.mealplanRecipes.concat(response.data.mealplan["recipes"]),
            mealplanIngredients: this.state.mealplanIngredients.concat(response.data.mealplan["recipe_info"])
        })
    }).catch(error => {
        console.log("mealplan-detail GET Error ", error)
    })
  }

  componentDidMount() {
      this.getMealplanItem();
  }

  render() {
      const renderRecipes = this.state.mealplanRecipes.map((recipe, idx => {
          return (
              <div key={idx}>
                  <h1>
                      {recipe.recipe_name}
                      {recipe.recipe_dificulty}
                  </h1>
              </div>
          )
      }))
      return (
          <div>
              <NavBar/>
              <Featured/>
              {renderRecipes}
          </div>
      )
  }
}

Answer 1

你的括号是错误的，地图函数的参数应该在它们自己的括号中。所以把它改成这样：

  const renderRecipes = this.state.mealplanRecipes.map((recipe, idx) => {
      return (
          <div key={idx}>
              <h1>
                  {recipe.recipe_name}
                  {recipe.recipe_dificulty}
              </h1>
          </div>
      )
  })

'recipe' 映射数组时未定义

'recipe' is not defined when mapping a array

reactjs

array.prototype.map