问3秒后不能调用函数角4

EN

 getUsersChat() {

        let clientsKeys: Array < any > ;

        let i = 0;
        // tslint:disable-next-line:prefer-const
        let key: any;
        // tslint:disable-next-line:no-shadowed-variable
        let element: any;

        this.mySegService.getChats().subscribe(res => {

          this.clientsShortList = new Array < any > ();
          clientsKeys = Object.keys(res);

          this.totalNumberClients += clientsKeys.length;

          clientsKeys.forEach(clientKey => {

            if (i < ++i && res[clientKey]['messages'] !== undefined) {
              this.clientsShortList.push({
                name: res[clientKey]['name'],
              });
            }


            if (res[clientKey]['name'] === this.chatcheck) {
              this.clientsShortList = new Array < any > ();
              this.clientsShortList.push({
                name: res[clientKey]['name'],
                number: '1'
              });
            }

            this.clientsShortList.reverse();
            console.log(this.clientsShortList);
          });

        });
        // this.newmessageNumber(this.clientsShortList);
        for (let index = 0; index < this.clientsShortList.length; index++) {
          element = this.clientsShortList[index]['name'];
        }

        this.mySegService.getChatsLast().subscribe(res => {
          // console.log(res);
          try {
            localStorage.setItem('user', res[0]['user']);
          } catch (error) {
            // nd
          }
          this.chatcheck = localStorage.getItem('user');
          console.log(this.chatcheck);
          if (this.chatcheck === element) {
            this.getUsersChat();
          }

        });



}

newmessageNumber(array: any) {
     // tslint:disable-next-line:no-shadowed-variable
     let element;
     let i = 0;

    for (let index = 0; index < array.length; index++) {
      element = array[index]['name'];
    }

    this.mySegService.getChatsLast().subscribe(res => {
       try {
        localStorage.setItem('user', res[0]['user']);
       } catch (error) {
        // nd
       }
       this.chatcheck = localStorage.getItem('user');
      // console.log(this.chatcheck);
       if (this.chatcheck === element ) {
            this.compare = '1';
      }
    });
    var self=this;
    for ( i ; i < 3; i++) {

      (function(i) {
          setTimeout(() => {
            self.getUsersChat();
          }, 1000 * i);
      })(i);
  }


 }