element Table表格获取勾选的数据

<template>
    <div>
        <el-table ref="elTable" :data="tableData" border default-expand-all @selection-change="handleSelectionChange">
          <el-table-column type="selection" width="55"></el-table-column>
        </el-table>
    </div>
</template>

<script>
export default {
    data () {
        return {
            targetSelectArr:[]  
        }
    },
    methods:{
        handleSelectionChange (selectionArr) {
            let _targetArr = []
            // 遍历已选择数据id
            selectionArr.map((item) => {
                _targetArr.push(item.id)
            })
            this.targetSelectArr = _targetArr
        }
    }
}
</script>

注：本人前端小白 ，如有不对的地方还请多多指教