Realizing tree-shaped secondary tables based on angular

  <div class="userContent_content">
    <div>
      <table>
        <tr>
          <td>Node name</td>
          <td>Node management IP</td>
          <td>Node login name</td> 
          <td>Node login password</td> 
        </tr>
        //Use ng-container as an empty tag to assist in placing for or if events, which cannot be found in the review element <ng-container *ngFor="let item of currentTotalList,let i = index">
          <tr>
            <td style="color: #04AEB4;cursor: pointer;" class="img">
              <div>
                <div>{{item.name}}</div>
                <div>
        //The following is a picture of an arrow, which switches between expanding and collapsing the arrow. By judging whether the current click index is equal to the list index, if it is equal, it will be expanded, otherwise it will be collapsed <img (click)="clickShowChildList(i,item.name)"
                    [attr.src]="i == currentClickOpenIndex?'../../assets/resource/img/bottom.png':'../../assets/resource/img/right.png'">
                </div>
              </div>
            </td>
            <td>{{item.ip}}</td>
            <td>{{item.username}}</td>
            <td>{{item.password}}</td>
          </tr>
        //Use the ng-container tag again to nest the child items of the table <ng-container *ngFor="let childItem of item.nodeList, let j = index">
        //Because the for loop and if judgment cannot coexist in the same tag, our hidden event if is placed in the tr tag. By judging whether the currently clicked index is consistent with the list index, it will be collapsed if they are equal, and displayed if they are not.
 
            <tr *ngIf="i == currentClickOpenIndex">
              <td style="color: #04AEB4;cursor: pointer;" class="img">
                <div>
                  <div>
                    {{childItem.masterIp}}</div>
                </div>
              </td>
              <td>{{childItem.ip}}</td>
              <td>{{childItem.username}}</td>
              <td>{{childItem.password}}</td>
            </tr>
          </ng-container>
        </ng-container>
 
      </table>
    </div>
    
  </div>

      .userContent_content{
        width: 100%;
        height: calc(~"100% - 60px");
        overflow:auto;
        >div:nth-child(1){
          >table{
            width: 100%;
            tr{
              td{
                width: 25%;
                text-align: center;
                font-size: 14px;
                color: #fff;
                padding: 16px 0px;
                box-shadow: 0 1px #333;
              }
            }
            .img {
              >div {
                width: 100%;
                display: flex;
                position: relative;
  
                >div:nth-child(1) {
                  width: 85%;
                  white-space: nowrap;
                  text-overflow: ellipsis;
                  -o-text-overflow:ellipsis;
                  overflow: hidden;
                  margin: 0 auto;
  
                }
              }
  
              img {
                height: 10px !important;
                width: 10px !important;
                margin-left: 0 !important;
                position: absolute;
                right: 0;
                top: 3px;
              }
            }
          }
        }
  
        >div:nth-child(2){
          height: 80px;
          width: 90%;
          display: flex;
          align-items: center;
          margin: 0 auto;
          justify-content: flex-end;
          #page{
            display: table;
          }
        }
      }

  clickShowChildList = (i,item)=>{
    console.log(i,this.currentClickOpenIndex)
    if(this.currentClickOpenIndex==i){
      this.currentClickOpenIndex = -1
    }else{
      this.currentClickOpenIndex = i
    }
  }