基于angular实现树形二级表格

  <div class="usercontent_content">
    <div>
      <table>
        <tr>
          <td>节点名称</td>
          <td>节点管理ip</td>
          <td>节点登录名</td> 
          <td>节点登录密码</td> 
        </tr>
        //使用ng-container作为空标签用于辅助放置for或者if事件，它在审查元素中是找不到的
        <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>
        //下面是箭头的图片，是展开和收起箭头的切换，通过判断当前点击索引与列表索引是否相等，相等则展开，否则收起
                  <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>
        //再次使用ng-container标签嵌套表格的子级
          <ng-container *ngfor="let childitem of item.nodelist, let j = index">
        //由于在同一个标签内，for循环和if判断不能同时共存，因此我们的隐藏事件if放置tr标签内，通过判断当前点击的索引与列表索引是否一致，相等则收起，不等则显示的功能。
 
            <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
    }
  }