docs(cheatsheet) adding JS specific syntax to cheatsheet

Closes #5861

modules/angular2/docs/cheatsheet/lifecycle hooks.md

@@ -2,11 +2,14 @@
 Directive and component change detection and lifecycle hooks
 @cheatsheetIndex 8
 @description
-(implemented as class methods)
+{@target ts dart}(implemented as class methods){@endtarget}
+{@target js}(implemented as component properties){@endtarget}
 
 @cheatsheetItem
-syntax(js ts):
+syntax(ts):
 `constructor(myService: MyService, ...) { ... }`|`constructor(myService: MyService, ...)`
+syntax(js):
+`constructor: function(MyService, ...) { ... }`|`constructor: function(MyService, ...)`
 syntax(dart):
 `MyAppComponent(MyService myService, ...) { ... }`|`MyAppComponent(MyService myService, ...)`
 description:
@@ -14,56 +17,72 @@ The class constructor is called before any other lifecycle hook. Use it to injec
 
 
 @cheatsheetItem
-syntax:
+syntax(ts dart):
 `ngOnChanges(changeRecord) { ... }`|`ngOnChanges(changeRecord)`
+syntax(js):
+`ngOnChanges: function(changeRecord) { ... }`|`ngOnChanges: function(changeRecord)`
 description:
 Called after every change to input properties and before processing content or child views.
 
 
 @cheatsheetItem
-syntax:
+syntax(ts dart):
 `ngOnInit() { ... }`|`ngOnInit()`
+syntax(js):
+`ngOnInit: function() { ... }`|`ngOnInit: function()`
 description:
 Called after the constructor, initializing input properties, and the first call to ngOnChanges.
 
 
 @cheatsheetItem
-syntax:
+syntax(ts dart):
 `ngDoCheck() { ... }`|`ngDoCheck()`
+syntax(js):
+`ngDoCheck: function() { ... }`|`ngDoCheck: function()`
 description:
 Called every time that the input properties of a component or a directive are checked. Use it to extend change detection by performing a custom check.
 
 
 @cheatsheetItem
-syntax:
+syntax(ts dart):
 `ngAfterContentInit() { ... }`|`ngAfterContentInit()`
+syntax(js):
+`ngAfterContentInit: function() { ... }`|`ngAfterContentInit: function()`
 description:
 Called after ngOnInit when the component's or directive's content has been initialized.
 
 
 @cheatsheetItem
-syntax:
+syntax(ts dart):
 `ngAfterContentChecked() { ... }`|`ngAfterContentChecked()`
+syntax(js):
+`ngAfterContentChecked: function() { ... }`|`ngAfterContentChecked: function()`
 description:
 Called after every check of the component's or directive's content.
 
 
 @cheatsheetItem
-syntax:
+syntax(ts dart):
 `ngAfterViewInit() { ... }`|`ngAfterViewInit()`
+syntax(js):
+`ngAfterViewInit: function() { ... }`|`ngAfterViewInit: function()`
 description:
 Called after ngAfterContentInit when the component's view has been initialized. Applies to components only.
 
 
 @cheatsheetItem
-syntax:
+syntax(ts dart):
 `ngAfterViewChecked() { ... }`|`ngAfterViewChecked()`
+syntax(js):
+`ngAfterViewChecked: function() { ... }`|`ngAfterViewChecked: function()`
 description:
 Called after every check of the component's view. Applies to components only.
 
 
 @cheatsheetItem
-syntax:
+syntax(ts dart):
 `ngOnDestroy() { ... }`|`ngOnDestroy()`
+syntax(js):
+`ngOnDestroy: function() { ... }`|`ngOnDestroy: function()`
 description:
 Called once, before the instance is destroyed.