下拉框展示数字，可以从数据类型来分析错误，接收的数据类型是 字符串， 但是value是数字类型
<el-col :span="18"><el-form-item label="癌种" prop="cancerType" :rules="form.columnId == 2 || form.columnId == 3 ? [{required:true}] : [{required:false}]"><el-select v-model="form.cancerType" placeholder="请选择" multiple style="width:100%"><el-option v-for="item in cancerList" :key="item.id" :label="item.title" :value="item.id"></el-option></el-select></el-form-item></el-col></el-row>
传的参数和接收的数据类型一致才不会出现错误，所以这里value 值转成了字符串，就可以解决问题
<el-col :span="18"><el-form-item label="癌种" prop="cancerType" :rules="form.columnId == 2 || form.columnId == 3 ? [{required:true}] : [{required:false}]"><el-select v-model="form.cancerType" placeholder="请选择" multiple style="width:100%"><el-option v-for="item in cancerList" :key="item.id" :label="item.title" :value="item.id+''"></el-option></el-select></el-form-item></el-col></el-row>
