以id作为唯一标识

模板

<el-table :data="data" ref="table"@select-all="selectAll"@select="select"style="width:100%"><el-table-column type="selection"></el-table-column><el-table-column prop="id" label="id"></el-table-column>
</el-table>

变量

data: [],
selection: []

监听数据变动用于处理回显

watch: {data(nv) {//添加默认值const vm = thisvm.$nextTick(d => {vm.data.forEach(d => {if (this.selection.includes(d.id)) {vm.$refs['table'].toggleRowSelection(d, true)}})})}
}

处理复选逻辑

//length  > 0 去重添加   length == 0 删除
selectAll(selection) {const vm = thisif (selection.length) {//去重添加vm.selection = [...new Set([...vm.selection, ...selection.map(d => d.id)])]} else {//删除table中在selection 中缓存的内容const delArr = this.data.map(d => d.id)vm.selection = vm.selection.filter(d => !delArr.includes(d))}
},
//有则删除，无则添加
select(selection, row) {const vm = thisfor (let i = 0; i < vm.selection.length; i++) {if (vm.selection[i] == row.id) {return vm.selection.splice(i, 1)}}vm.selection.push(row.id)
}