每天抽出一些时间学习 Angular2 ，并准备把手头上的项目移植为 Angular2 , 不过今天又遇到了一些小问题。

准备写一个导航类适于管理后台常见的右边导航，如博客园的这种：

!

使用 g generate component nav-left 建立了一个名为 nav-left 的导航组件。

这里需要检查app,modile.ts中是否已经有你新建的组件。一般会自动添加，如果不存在需要添加引用：

import { NavLeftComponent } from './nav-left/nav-left.component';

模块装饰器需要添加：

@NgModule({
declarations: [
NavLeftComponent,
]
})

并在 nav-left.component.ts 中新建了一个类，Item 用来保存菜单的项，代码如下：

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-nav-left',
  templateUrl: './nav-left.component.html',
  styleUrls: ['./nav-left.component.css'],
})

export class NavLeftItem{
    name:string;
    path:string;
    data:any;
    active?:string="";
}

export class NavLeftComponent implements OnInit {

  constructor() { }
}

开开心心的运行查看报错结果^^~!

报错的信息忘截图了，大致的意思是找不到这个模块，或这个模块没办法解析。

这步骤花了好长时间，最终确定问题竟然有两处，也没继续深研，分别是：

1：需要单独创建数据类。把Item单独提取一个类。 最终结果如图：

2：我在组件中写了一些预定义的数据，如下：

  //这里需要注意变量顺序，我这里是错的，因为titleList中的其他变量引用还未定义。。。。
  public titleList :Array<{"name":string,"list":any}> =[
    {"name":"后台工具","list":this.adminTool},
    {"name":"运维工具","list":this.maintenanceTool},
    {"name":"运营工具","list":this.statisticalTool},
    {"name":"GM工具","list":this.gmlTool}
  ];

  /**
   * 后台工具
   */
  public adminTool:Array<NavLeftItem> = [
    {"name":"账号列表","path":"manage/index","data":null},
    {"name":"账号权限","path":"manage/index","data":null},
    {"name":"账号密码","path":"manage/index","data":null},
    {"name":"账号添加","path":"manage/index","data":null},
    {"name":"游戏列表","path":"manage/index","data":null},
    {"name":"渠道列表","path":"manage/index","data":null},
    {"name":"渠道添加","path":"manage/index","data":null},
    {"name":"操作日志","path":"manage/index","data":null},
    {"name":"操作详情","path":"manage/index","data":null},
  ];
  /**
   * 运维工具
   */
  public maintenanceTool:Array<NavLeftItem> = [
    {"name":"Log服务器列表","path":"manage/index","data":null},
    {"name":"Log服务器添加","path":"manage/index","data":null},
    {"name":"Log入口服务列表","path":"manage/index","data":null},
    {"name":"Log入口服务配置","path":"manage/index","data":null},
    {"name":"Log服务器状态","path":"manage/index","data":null},
    {"name":"Log服务器日志","path":"manage/index","data":null},
    {"name":"Log服务器Qps统计","path":"manage/index","data":null},
    {"name":"Log服务器数据库信息","path":"manage/index","data":null},
    {"name":"Log服务器合并","path":"manage/index","data":null},
  ];

一直编译不通过，最终确定问题是顺序问题。。。很尴尬。修改顺序为：

先定义：titleList 然后定义其他几项。

问题解决。~~~~~~~~