例如要编辑已支付不能大于预估成本

          <template slot-scope="{row}">
          <template v-if="row.rowEdit">
            <el-input v-model="settlementList.supplierPaidAmount"
             @input.native="isTrueNum(row,$event);" />
          </template>
          

            methods: {
            isTrueNum(row,event){
     			this.$nextTick(() => {
      			 if(row.estimatedGenerationCost-event.target.value<0){
          			alert("超过值了，请重新输入")
          			//
          event.target.value = event.target.value.slice(0,event.target.value.length-1)
          this.settlementList.supplierPaidAmount=event.target.value
       }
         })
           },
         // 举一反三，假如要让编辑的长度不大于某个数直接在input里面写
         οninput="if(value.length>5)value=value.slice(0, 5)"