angular - Facing Error: angular4 error:val.slice is not a function? -


i running error:

click refresh() or delectrole(i) button error:

error typeerror: val.slice not function     @ datatable.set [as value] (datatable.js:508)

what's wrong? data can transmitted, needs flushed display

which value not function? remove 'i',but doesn't work: 

import { component, oninit, viewchild } '@angular/core'; import { role } '../domain/role'; import { roleservice } '../service/role.service'; import { requestoptions , headers} '@angular/http'; @component({     templateurl: 'rolelist.html',       providers: [confirmationservice]     })     export class rolelist implements oninit  {         public loading = false;         roles: any;         // 开启switch         active: boolean = true;         delectselectedidjson: string;                                  msgs: message[] = [];                                          constructor(private roleservice: roleservice, private confirmationservice: confirmationservice, ) { }         ngoninit() {             this.loading = true;             this.roleservice.getrolelist({}).then(roles => {                 this.loading = false;                 this.roles = roles.all;             });         }          // refresh           refresh() {             this.loading = true;             this.roleservice.getrolelist({}).then(roles => {this.roles = roles; this.loading = false; });         }         // delectrole           delectrole(i) {               this.loading = true;               this.delectselectedidjson = json.stringify({'roleid': i});               this.roleservice.getroledelect(this.delectselectedidjson).then(roles => {                        this.roles = roles;                        if (roles.code === '0000') {                           this.loading = false;                           this.refresh();                         } else if (roles.code === '4000') {                            this.loading = false;                              return false;                         }                     });         }     }  <a class="btn btn-default" (click)="delectrole(role[col.field])" *ngif="roledelete()"><i class="fa fa-trash"></i></a>  <a class="btn btn-default" (click)="refresh()"><i class="fa fa-refresh"></i>refresh</a>


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