javascript - 从 Vue.js 2 中的计算属性推送到数组

Question

我希望从 Vue.js 2 中的计算属性中推送到一个数组，Vue 正在 Laravel 中使用，我收到以下响应。

createSelection:"(error during evaluation)"

正在使用以下代码:

<template>
  <div>
    <div>Credits carried through: {{ credits }}</div>
    <div v-for="meal in meals">
      {{meal}}
      <input :id="meal" :name="meal" v-model.number="creditsPerMeal[meal]" type="number">
    </div>
    <div>
      Credits used: {{creditsSum}}/{{credits}}
    </div>
  </div>
</template>

<script>
  export default {

    mounted() {
        console.log('Component ready.');

        console.log(JSON.parse(this.f));

    },

    props: ['f','c'],

    name: 'credits',
    data: function () {
     var meals = JSON.parse(this.f)

     var creditsPerMeal = {}
     for (var i = 0; i < meals.length; i++) {
       creditsPerMeal[meals[i]] = 0
     }

     var createSelection = []


      return {
        credits: this.c,
        meals,
        creditsPerMeal
      }
    },

    computed: {
      creditsSum () {
        return Object.values(this.creditsPerMeal).reduce((a, b) => a + b, 0)
      },

      createSelection: function (){
        for (var i = 0; i < meals.length; i++) {
           createSelection.push({
              food: meals[i],
              quantity: creditsPerMeal[meals[i]]
            })
          }
      }
    }
  }
</script>

Answer 1

计算方法应该返回一些东西，实际上他们不应该做任何事情，只是计算一些东西然后返回。您的计算方法根本没有返回。首先将您的推送逻辑移至方法:

   computed: {
      creditsSum () {
        return Object.values(this.creditsPerMeal).reduce((a, b) => a + b, 0)
      },
   },
   methods: {
      createSelection (){
          for (var i = 0; i < meals.length; i++) {
              createSelection.push({
                 food: meals[i],
                 quantity: creditsPerMeal[meals[i]]
              })
          }
      }
   }

此外，error during evaluation 不是问题的描述，看起来不像 Vue 问题，也许您可​​以提供更详细的错误？