angular-cn/public/docs/js/latest/api/di/Key-class.jade

p.location-badge.
  exported from <a href="/angular2/di.html">angular2/di</a>
  defined in <a href="https://github.com/angular/angular/tree/master/modules/angular2/src/di/key.js#L17">angular2/src/di/key.js (line 17)</a>

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  A unique object used for retrieving items from the <a href='Injector-class.html'><code>Injector</code></a>.
  
  Keys have:
  - a system-wide unique `id`.
  - a `token`, usually the `Type` of the instance.
  
  Keys are used internally by the <a href='Injector-class.html'><code>Injector</code></a> because their system-wide unique `id`s allow the
  injector to index in arrays rather than looking up items in maps.
  
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  h2 Members
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    h3 constructor

    
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      code.
        constructor(token, id)
    
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    h3 displayName

    
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    h3 get

    
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      code.
        get(token)
    
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      Retrieves a `Key` for a token.





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    h3 id

    
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    h3 numberOfKeys

    
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    h3 token

    
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