本篇文章记录el-table增加一行可编辑的数据列，进行增删改。

1.增加空白行

直接在页面mounted时对form里面的table列表增加一行数据，直接使用push() 方法增加一列数据这个时候也可以设置一些默认值。比如案例里面的 产品件数 。

	mounted() {
		this.$nextTick(() => {
			this.addFormData.productList.push({
				productName: '',//产品名称
				price: '',//单价(元/㎡)
				productCount: '1', //产品件数
				totalAmount: '', //小计￥元
			})
		})
	},

2.产品名称选中拿到数据展示到列表行

因为当前案例的产品名是下拉选择的，所以我们要请求接口拿到数据渲染到下拉列表，这里直接使用了假数据。

	data() {
		return {
			addFormData: {
				// 产品列表
				productList: [],
			},
			addFormRules: {
				productName: [{
					required: true,
					message: '请选择产品',
					trigger: 'blur'
				}],
				price: [{
					required: true,
					message: '请输入单价',
					trigger: 'blur'
				}
				],
				productCount: [{
					required: true,
					message: '请输入产品件数',
					trigger: 'blur'
				}]
			},
			optionsList: [
				{
					id:1,
					productName:'橘子',
					price:'10',
				},
				{
					id:2,
					productName:'苹果',
					price:'8',
				}
			]

		}
	},

		<el-form ref="addFormRef" :model="addFormData" :rules="addFormRules" size="mini" :inline="true">
			<el-table tooltip-effect="light" :data="addFormData.productList" >
				<el-table-column label="产品名称" prop="productName" min-width="150">
					<template slot-scope="scope">
						<el-form-item size="mini" :prop="'productList.' + scope.$index + '.productName'"
							:rules="addFormRules.productName" class="all">
							<el-select v-model="scope.row.productName" filterable value-key="id" placeholder="请选择"
								@change="pestChange($event, scope.$index)">
								<el-option v-for="item in optionsList" :key="item.id" :label="item.productName"
									:value="item">
								</el-option>
							</el-select>
						</el-form-item>
					</template>
				</el-table-column>
				<el-table-column label="操作" align="center" class-name="small-padding fixed-width" fixed="right"
					width="150">
					<template slot-scope="scope">
						<el-button size="mini" type="text" icon="el-icon-edit" @click="handleUpdateYes(scope.row)"
							v-hasPermi="['system:order:edit']">增加</el-button>
						<el-button size="mini" type="text" icon="el-icon-delete" @click="handleDeleteProduct(scope.row)"
							v-hasPermi="['system:order:remove']">删除</el-button>
					</template>
				</el-table-column>
			</el-table>
			<el-form-item size="large">
				<el-button type="primary" @click="handleSubmitAdd">提交</el-button>
				<el-button @click="handleCancelAdd">取消</el-button>
			</el-form-item>
		</el-form>


		pestChange(e, index) {
            //此时的e 就是optionsList中的某一项
            //让后解构赋值给我们这一行对应的值 
			let data = this.addFormData.productList[index]
			Object.keys(data).forEach(key => {
				data[key] = e[key]
			})
			this.addFormData.productList[index].productCount = 1
		},

3.小计通过(计算属性计算值)

		<el-form ref="addFormRef" :model="addFormData" :rules="addFormRules" size="mini" :inline="true">
			<el-table tooltip-effect="light" :data="addFormData.productList" >
				<el-table-column label="小计￥元" prop="totalAmount" width="100">
					<template slot-scope="scope">
						<div class="notext">
							{{ getTotalAmount(scope.row) }}
						</div>
					</template>
				</el-table-column>
				<el-table-column label="操作" align="center" class-name="small-padding fixed-width" fixed="right"
					width="150">
					<template slot-scope="scope">
						<el-button size="mini" type="text" icon="el-icon-edit" @click="handleUpdateYes(scope.row)"
							v-hasPermi="['system:order:edit']">增加</el-button>
						<el-button size="mini" type="text" icon="el-icon-delete" @click="handleDeleteProduct(scope.row)"
							v-hasPermi="['system:order:remove']">删除</el-button>
					</template>
				</el-table-column>
			</el-table>
			<el-form-item size="large">
				<el-button type="primary" @click="handleSubmitAdd">提交</el-button>
				<el-button @click="handleCancelAdd">取消</el-button>
			</el-form-item>
		</el-form>

	computed: {
		getTotalAmount(){
			return (data) => {
				//先判断单价和数量必须存在
				if (data.productCount && data.price) {
					data.totalAmount = parseInt(data.productCount) * parseInt(parseFloat(data.price))
					return data.totalAmount
				} else {
					return 0.00
				}
			}
		}
	},

4.再增加一行复用上一行的数据

		handleUpdateYes(row) {
            //拿到上一行数据再往数组中push（）新的数据
			this.addFormData.productList.push({
				productName: row.productName,//产品名称
				price: row.price,//单价(元/㎡)
				productCount: row.productCount, //产品件数
				totalAmount: '', //小计￥元
			})
		},

5.删除某一行

		// 删除产品
		handleDeleteProduct(row) {
			this.$confirm('此操作将永久删除该产品信息, 是否继续?', '提示', {
				confirmButtonText: '确定',
				cancelButtonText: '取消',
				type: 'warning'
			}).then(() => {
				this.$message({
					type: 'success',
					message: '删除成功!'
				});
				this.addFormData.productList.splice(row.index, 1)
			}).catch(() => {
				this.$message({
					type: 'info',
					message: '已取消删除'
				});
			});
		},

6.点击提交对表单校验

		// 添加订单表单提交
		handleSubmitAdd() {
			this.$refs.addFormRef.validate(async (valid) => {
				if (!valid) return
				//校验通过 往下执行
			})
		},