没有导出成员的MD_XXX_DIRECTIVES

Question

我是Angular2的新手。所以我在项目中使用角质材料的过程中。但是，我有这样的：

“无导出成员MD_XXX_DIRECTIVES”错误(例如: MD_SIDENAV_DIRECTIVES、MD_LIST_DIRECTIVES)。

这些是package.json依赖项：

"dependencies": {
    "@angular/common": "2.0.0-rc.4",
    "@angular/compiler": "2.0.0-rc.4",
    "@angular/core": "2.0.0-rc.4",
    "@angular/forms": "0.2.0",
    "@angular/http": "2.0.0-rc.4",
    "@angular/platform-browser": "2.0.0-rc.4",
    "@angular/platform-browser-dynamic": "2.0.0-rc.4",
    "@angular/router": "3.0.0-beta.2",
    "@angular/router-deprecated": "2.0.0-rc.2",
    "@angular/upgrade": "2.0.0-rc.4",
    "@angular2-material/button": "^2.0.0-alpha.5-2",
    "@angular2-material/card": "^2.0.0-alpha.5-2",
    "@angular2-material/checkbox": "^2.0.0-alpha.5-2",
    "@angular2-material/core": "^2.0.0-alpha.8-2",
    "@angular2-material/grid-list": "^2.0.0-alpha.6",
    "@angular2-material/icon": "^2.0.0-alpha.5-2",
    "@angular2-material/input": "^2.0.0-alpha.5-2",
    "@angular2-material/list": "^2.0.0-alpha.5-2",
    "@angular2-material/progress-circle": "^2.0.0-alpha.6",
    "@angular2-material/radio": "^2.0.0-alpha.5-2",
    "@angular2-material/sidenav": "^2.0.0-alpha.5-2",
    "@angular2-material/toolbar": "^2.0.0-alpha.5-2"}

谢谢你的帮助。

Answer 1

使用npm包版本中的^标识符，让npm安装最新版本。最新版本不再导出指令，而是导出模块。删除它，然后删除软件包和安装特殊需要的版本(2.0.0-字母表-2)允许再次使用指令。