1、如图：

elementUI技巧：在 el-table中校验el-input输入框_javascript

2、表格代码

说明：列表必须在dataForm中定义，el-input必须使用el-form-item包裹

<el-table :data="dataForm.itemList" border size="mini" class="item-table" height="250"
          @selection-change="selectionChangeHandle" ref="itemTable"
          :header-cell-style="{ background: '#fcfcfc', color: '#606266', height:'36px'}">
    <el-table-column type="selection" header-align="center" align="center" width="50">
    </el-table-column>
    <el-table-column type="index" header-align="center" align="center" width="40" label="#">
    </el-table-column>
    <el-table-column prop="productCode" header-align="center" width="150" align="center" label="药品编码">
      <template slot-scope="scope">
        <el-form-item :prop="'itemList.'+scope.$index+'.productCode'" :rules="rules.productCode">          
            <el-input size="mini" v-model="scope.row.productCode" disabled class="product-code-input"> </el-input>           
        </el-form-item>
        
      </template>
    </el-table-column>
</el-table>

3、js验证

data(){
        var checkValue = (rule, value, callback) => {
            // 只能输入数字（正数和负数，小数整数）
            let reg =/^([-+]?[0-9]+[\d]*(.[0-9]{1,})?)$/
            let res = reg.test(value);
            if(res){
                callback();
            }else{
                callback(new Error(""))
            }            
        }
        return {
            dataForm:{
                itemList:[]
            },
            rules:{
                productCode:[{ required: true,message :"产品编码不能为空",validator:checkValue ,trigger:       
                       "blur"}]
            },
        }
    }

4、提交表单前验证

this.$refs.dataForm.validate(async(valid) => {
        // 校验通过
        if(valid){
 
        }
 
}