this的問題

let dealData = data.map((item)=>{
   return {
     id: item.id,
     mark: item.ename,
     name: item.name,
     type: item.type,
     remark: item.remark,
   }
 })
 that.tableData = dealData;
 this.tableData = dealData;
        
 //that.tableData = [ { "id": 2, "rpa": { "id": 2 }, "level": 1, "mark": "browserOpen", "name": "打開瀏覽器111111", "type": "組件", "flowId": 1, "compId": "3", "functionName": "browserOpen1" }, { "id": 3, "rpa": { "id": 3 }, "level": 1, "mark": "keyboard", "name": "鍵盤", "type": "組件", "remark": "", "flowId": 1, "compId": "2", "functionName": "keyboard1" }, { "id": 4, "rpa": { "id": 4 }, "level": 1, "mark": "mouse", "name": "鼠標", "type": "組件", "remark": "", "flowId": 1, "compId": "1", "functionName": "mouse1" } ];
console.log('this.tableData------',this.tableData);
 //that.$forceUpdate();
 //debugger