1.項目中字符串特別是\r\n,替換成br之後，在頁面換行無法生效？

答：綁定元素 innerHTML。

 <div class="panel-body" [innerHTML]="proTxt(iosPkg.ReleaseNotes)"></div>

 proTxt(txt: string) {
        return txt && txt.replace(/\r?\n/g, "<br />").replace(‘undefined‘,‘暫無版本信息‘);
    }

2.Error trying to diff ‘[object Object]‘. Only arrays and iterables are allowed

答：問題原因是由於ngFor 循環的對象不是數組或者可遍歷對象造成的，解決辦法需要將之轉成數組對象。項目裏接口返回的是一個json object,我這裏定義一個數組對象來push 這個object，就解決問題了！

<div class="panel panel-default" *ngFor="let andoridPkg of andoridPackage;let i = index;">
                    <div class="panel-heading">
                        <h4 class="panel-title"
 
>
                            {{currApp.Name}}
                            &nbsp;&nbsp;版本<font color="#ff0000">V{{andoridPkg.Version}}</font>
                            &nbsp;&nbsp;<span class="pkg-update-time">(更新時間:{{andoridPkg.CreatedOn | date: ‘yyyy年MM月dd日‘}})</
 
span>
                            <a data-toggle="collapse" class="pkg-update-link" (click)="onCollapse(i,‘andorid‘)" data-parent="#android" href="#collapse_android_{{i}}">
                                {{andoridPkg.isCollapse ? ‘收起‘ : ‘展開更多‘}}
                                <i class="arrow {{andoridPkg.isCollapse ? ‘arrow-up‘:‘arrow-down‘}}"></i>
                            </a>
                        </h4> 
                    </div>
                    <div id="collapse_android_{{i}}" class="panel-collapse collapse">
                        <div class="panel-body" [innerHTML]="proTxt(andoridPkg.ReleaseNotes)"></div>
                    </div>
                </div>
                <div *ngIf="andoridPackage.length<=0">暫無版本記錄</div>

 id: string;
    currApp: any = [];
    andoridPackage: any[] = [];
    iosPackage: any[] = [];
    ngOnInit(): void {
        this.actRouter.params.subscribe((params: Params) => {
            this.id = params["id"];
            this.appService.GetAppInfo(this.id, (rtv) => {
                this.currApp = rtv;
                rtv.AndoridPackage && this.andoridPackage.push(rtv.AndoridPackage);
                rtv.iOSPackage && this.iosPackage.push(rtv.iOSPackage);
            });
        });

    }

積累中，未完待續，隨時更新...

【angular5項目積累總結】遇到的一些問題以及解決辦法