为什么有值依然报async-validator ['xxx is required']

问题描述：

点击确定时，前端控制台打印如下：

 但是实际上startStationName和endStationName均有值，如下所示：

代码：

<el-dialog :title="textMap[dialogStatus]" :visible.sync="dialogFormVisible" width="980px" @close="closeDialog">
      <el-form :model="ruleForm" :rules="rules" ref="ruleForm" label-width="170px">
        <el-row type="flex" class="row-bg">
          <el-col :span="12">
            <el-form-item label="起点:" prop="startStationName">
              <el-input v-model="ruleForm.startStationName" readonly  style="width: 240px;">
                <el-button type="primary" slot="append" icon="el-icon-search" @click="zdSelect('startStation')">选择</el-button>
              </el-input>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="终点:" prop="endStationName">
              <el-input v-model="ruleForm.endStationName" readonly  style="width: 240px;">
                <el-button type="primary" slot="append" icon="el-icon-search" @click="zdSelect('endStation')">选择</el-button>
              </el-input>
            </el-form-item>
          </el-col>
        </el-row>
        <el-row type="flex" class="row-bg">
          <el-col :span="12">
            <el-form-item label="运价:" prop="price">
              <el-input v-model="ruleForm.price" clearable style="width: 240px;"></el-input>
            </el-form-item>
          </el-col>
        </el-row>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitForm('ruleForm')">确 定</el-button>
      </span>
    </el-dialog>

数据模型：

data() {return {
        ruleForm: {
          startStation:null,
          endStation:null,
          price: null
        },

　　　　rules: {
  　　　　startStationName: [{ required: true, message: '请选择起点', trigger: 'change' }],
 　　　　 endStationName: [{ required: true, message: '请选择终点', trigger: 'change' }],
 　　　　 price: [{ required: true, validator: validateNumber, trigger: 'blur' }]
　　　　},

 } },

后来发现是名称不一致导致的，修改如下：

data() {
      return {
        ruleForm: {
          startStationName:null,
          endStationName:null,
          price: null
        },
      }
    },