“您将 v-model 直接绑定到 v-for 迭代别名"； [英] "You are binding v-model directly to a v-for iteration alias"

问题描述

刚刚遇到这个我以前没有遇到过的错误:您将 v-model 直接绑定到 v-for 迭代别名.这将无法修改 v-for 源数组，因为写入别名是就像修改函数局部变量一样.考虑使用对象数组并在对象属性上使用 v-model."我有点困惑，因为我似乎没有做错任何事.与我之前使用过的其他 v-for 循环的唯一区别是，这个循环稍微简单一点，因为它只是遍历字符串数组，而不是对象:

Just run into this error I hadn't encountered before: "You are binding v-model directly to a v-for iteration alias. This will not be able to modify the v-for source array because writing to the alias is like modifying a function local variable. Consider using an array of objects and use v-model on an object property instead." I am a little puzzled, as I don't appear to be doing anythong wrong. The only difference from other v-for loops I've used before is that this one is a little simpler, in that it's simply looping through an array of strings, rather than objects:

 <tr v-for="(run, index) in this.settings.runs">

     <td>
         <text-field :name="'run'+index" v-model="run"/>
     </td>

     <td>
        <button @click.prevent="removeRun(index)">X</button>
     </td>

 </tr>

错误消息似乎表明我需要让事情变得更复杂一些，并使用对象而不是简单的字符串，这在某种程度上对我来说似乎不正确.我错过了什么吗?

The error message would seem to suggest that I need to actually make things a little more complicated, and use objects instead of simple strings, which somehow doesn't seem right to me. Am I missing something?

推荐答案

由于您使用的是 v-model，您希望能够更新 run 值来自输入字段(text-field 是基于文本输入字段的组件，我假设).

Since you're using v-model, you expect to be able to update the run value from the input field (text-field is a component based on text input field, I assume).

该消息告诉您不能直接修改 v-for 别名(run 是).相反，您可以使用 index 来引用所需的元素.您可以在 removeRun 中类似地使用 index.

The message is telling you that you can't directly modify a v-for alias (which run is). Instead you can use index to refer to the desired element. You would similarly use index in removeRun.

new Vue({
  el: '#app',
  data: {
    settings: {
      runs: [1, 2, 3]
    }
  },
  methods: {
    removeRun: function(i) {
      console.log("Remove", i);
      this.settings.runs.splice(i,1);
    }
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.5.18/vue.js"></script>
<table id="app">
  <tr v-for="(run, index) in settings.runs">
    <td>
      <input type="text" :name="'run'+index" v-model="settings.runs[index]" />
    </td>
    <td>
      <button @click.prevent="removeRun(index)">X</button>
    </td>
    <td>{{run}}</td>
  </tr>
</table>

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