<template>
 <Form model="questionFormData" :rules="questionRules" refs="questionFormRefs">
    <FormItem prop="question" lable="問題描述">
      <Input v-model="questionFormData.question"></Input>
    </FormItem>
  </Form>
</template>
<script>
  export default {
    data() {
      return {
        questionFormData: {
          question: ''
        },
        questionRules: {
          question: [{
            { required: true, message: "不允許為空", trigger: "blur" },
          }]
        }
      }
    },
    methods: {
      handleSubmit() {
        this.$refs[name].validate(async valid => {
          // valid true驗(yàn)證通過，false 驗(yàn)證不通過
      	});
      }
    }
  }
</script>

:prop="'items.' + index + '.value'"
:rules="{required: true, message: 'Item ' + item.index +' can not be empty', trigger: 'blur'}"

<template>
<Form model="questionFormData" :rules="questionRules" refs="questionFormRefs">
    <FormItem 
        v-for="(item, index) of questionFormData.questions"
        :prop="'questions.' + index +'.question'"
        :rules="{required: true, message: '問題' + (index + 1) + '不允許為空', trigger: 'blur'}"
        :lable="'問題' + (index + 1) +'描述"
    >
    <Input v-model="questionFormData.question[index]"></Input>
  </FormItem>
</Form>
</template>
<script>
	export default {
    data() {
      return {
        questionFormData: {
          questions: [{
            id: 1,
            question: '問題1'
          }, {
            id: 2,
            question: '問題2'
          }],
        },
        questionRules: {
        }
      }
    }
  }
</script>

computed: {
  fieldValue () {
    // FormInstance 是當(dāng)前Form的實(shí)例，獲取到model，也就是questionFormData
    const model = this.FormInstance.model;
    if (!model || !this.prop) { return; }
		// 此處的prop 就是 questions.0.question
    let path = this.prop;
    // 如果遇到:就替換為點(diǎn)，如questions:0.question -> questions.0.question
    if (path.indexOf(':') !== -1) {
      path = path.replace(/:/, '.');
    }
    // 獲取到questions.0.question在questionFormData的值
    return getPropByPath(model, path).v;
  },
},
function getPropByPath(obj, path) {
  // tempObj = questionFormData
  let tempObj = obj;
  // 將中括號(hào)替換為. 如 questions[0][question] -> questions.0.question
  path = path.replace(/\[(\w+)\]/g, '.$1'); 
  // 替換首個(gè).， .questions.0.question -> questions.0.question 最終處理成這個(gè)格式
  path = path.replace(/^\./, '');
  // 分割成數(shù)組 得到 ['questions','0','question']
  let keyArr = path.split('.');
  let i = 0;
	// 以 i = 0來查此處代碼作用
  for (let len = keyArr.length; i < len - 1; ++i) {
    // key = questions
    let key = keyArr[i];
    // questions 在 questionFormData中，進(jìn)入為true的代碼塊
    if (key in tempObj) {
      // tempObj = questions
      tempObj = tempObj[key];
    } else {
      throw new Error('[iView warn]: please transfer a valid prop path to form item!');
    }
  }
  return {
    o: tempObj, // { id: 1, question: '問題1' }
    k: keyArr[i], // question
    v: tempObj[keyArr[i]] // 問題1
  };
 }