{"id":39650,"date":"2023-08-22T06:16:01","date_gmt":"2023-06-29T13:57:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/angular2%e7%ae%a1%e9%81%93%e7%9a%84%e7%ac%94%e8%ae%b0\/"},"modified":"2024-04-30T19:36:34","modified_gmt":"2024-04-30T11:36:34","slug":"angular2%e7%ae%a1%e9%81%93%e7%9a%84%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/angular2%e7%ae%a1%e9%81%93%e7%9a%84%e7%ac%94%e8%ae%b0\/","title":{"rendered":"Angular2\u7ba1\u9053\u7684\u7b14\u8bb0"},"content":{"rendered":"

\u7ed3\u8bba\u3002<\/h1>\n

\u73b0\u5728\u4e0d\u53ef\u80fd<\/del><\/p>\n

\u6211\u5b8c\u5168\u7406\u89e3\u4e86 (\u6709\u70b9\u5c0f\u81ea\u8c6a\u611f)<\/p>\n

\u7ba1\u5b50\uff0c\u6bd4\u6211\u60f3\u8c61\u7684\u5389\u5bb3\u591a\u4e86\u3002\u591a\u4e8f\u4e86@shuhei\u7684\u8bc4\u8bba\uff0c\u6211\u80fd\u591f\u5927\u6b65\u5411\u524d\u4e86\u3002<\/p>\n

\u51c6\u5907\u51c6\u5907<\/h1>\n

\u521b\u5efaPipe<\/h2>\n

\u5728\u4e2d\u6587\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u7ffb\u8bd1\u4e0a\u8ff0\u5185\u5bb9\uff1a<\/p>\n

Pipe\u7c7b\u662f\u7ee7\u627f\u81eaPipe\u7c7b\u7684\u4e00\u4e2a\u7c7b\u3002\u7ee7\u627f\u81eaPipe\u7c7b\u7684\u7c7b\u5fc5\u987b\u5177\u5907supports\u548ctransform\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u3002\u53e6\u5916\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u7528\u4e8e\u5b9e\u4f8b\u5316Pipe\u5bf9\u8c61\u7684PipeFactory\u3002PipeFactory\u7c7b\u5fc5\u987b\u5177\u5907create\u65b9\u6cd5\u3002\u8fd9\u4e24\u8005\u5e76\u4e0d\u4e00\u5b9a\u9700\u8981\u662f\u4e0d\u540c\u7684\u7c7b\uff0cPipe\u7c7b\u672c\u8eab\u4e5f\u53ef\u4ee5\u5145\u5f53PipeFactory\u7684\u89d2\u8272\u3002<\/p>\n

\u63a5\u6536\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5b9a\u4e49\u5982\u4e0b\u7684Pipe\u548c\u5176Factory\uff0c\u4f7f\u5176\u91cd\u590d\u4e24\u6b21\u3002<\/p>\n

import<\/span> 'package:angular2\/change_detection.dart'<\/span>;<\/span>\r\n\r\nclass<\/span> DoublePipeFactory<\/span> extends<\/span> Pipe<\/span> {<\/span>\r\n  bool<\/span> supports<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\r\n    return<\/span> obj<\/span> is<\/span> String<\/span>;<\/span>\r\n  }<\/span>\r\n\r\n  dynamic<\/span> transform<\/span>(<\/span>dynamic<\/span> value<\/span>)<\/span> {<\/span>\r\n    return<\/span> \"<\/span>${value}${value}<\/span>\"<\/span>;<\/span>\r\n  }<\/span>\r\n\r\n  Pipe<\/span> create<\/span>(<\/span>ChangeDetectorRef<\/span> cdRef<\/span>)<\/span> {<\/span>\r\n    return<\/span> this<\/span>;<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4ecePipe\u7c7b\u4e2d\u8fdb\u884c\u8986\u76d6\u7684\u662f\u4ee5\u4e0b\u4e24\u4e2a\u65b9\u6cd5\u3002<\/p>\n
\u662f\u5426\u652f\u6301(obj)<\/h3>\n
\u7ed9\u5b9a\u4e00\u4e2a\u52a8\u6001\u7c7b\u578b(JS\u4e2d\u4e3aany?)\u7684\u5bf9\u8c61\uff0c\u5e76\u5224\u65ad\u7ba1\u9053\u662f\u5426\u6709\u6548\u3002\u7ed9\u5b9a\u7684\u5bf9\u8c61\u662f\u5728\u4f7f\u7528\u7ba1\u9053\u65f6\u7684\u5de6\u4fa7\u3002\u7531\u4e8e\u672c\u6b21\u4ec5\u9650\u5236\u4e3a\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u6240\u4ee5\u5f53\u4e3aString\u7c7b\u578b\u65f6\u8fd4\u56detrue\u3002<\/p>\n
\u52a8\u6001\u8f6c\u6362\uff08\u52a8\u6001\u503c\uff09<\/h3>\n
\u8fdb\u884cPipe\u7684\u8f6c\u6362\u64cd\u4f5c\u3002\u8fd4\u56de\u7c7b\u578b\u4e0d\u9700\u8981\u4e0e\u53c2\u6570\u5339\u914d\uff0c\u4f8b\u5982\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u63a5\u6536\u5217\u8868\u5e76\u8fd4\u56de\u4ec5\u5305\u542b\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684Pipe\u3002<\/p>\n
\u6211\u4eec\u5df2\u7ecf\u5b9e\u73b0\u4e86\u4ee5\u4e0b\u65b9\u6cd5\u6765\u4f5c\u4e3aPipeFactory\u7684\u884c\u4e3a\u3002<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u7ba1\u9053(ChangeDetectorRef cdRef)\u3002<\/h3>\n
\u8fd4\u56dePipe\u7684\u5b9e\u4f8b\u3002\u7531\u4e8e\u6b64\u6b21Pipe\u672c\u8eab\u517c\u5177\u5de5\u5382\u529f\u80fd\uff0c\u56e0\u6b64\u8fd4\u56dethis\u3002\u53c2\u6570cdRef\u7528\u4e8e\u63a7\u5236\u66f4\u65b0\u65f6\u673a\uff0c\u4f46\u5728\u540c\u6b65\u5904\u7406\u8303\u56f4\u5185\u4e0d\u9700\u8981\u4f7f\u7528\u3002\u5177\u4f53\u7684\u4f7f\u7528\u65b9\u6cd5\u53ef\u4ee5\u53c2\u8003\u5185\u7f6e\u7684AsyncPipe\u5b9e\u73b0\u3002<\/p>\n
\u5c06\u4fe1\u606f\u6ce8\u518c\u5230PipeRegistry<\/h2>\n
\u521b\u5efa\u7684Pipe\u53ef\u4ee5\u901a\u8fc7\u5c06\u5176\u6ce8\u518c\u5230PipeRegistry\u4e2d\uff0c\u4f7f\u5176\u80fd\u591f\u5728Angular\u4e2d\u4f5c\u4e3aPipe\u4f7f\u7528\u3002\u7531\u4e8e\u8fd8\u6ca1\u6709\u7b80\u6d01\u7684API\u6765\u8fdb\u884c\u6ce8\u518c\uff0c\u6240\u4ee5\u76ee\u524d\u7684\u5b9e\u73b0\u76f8\u5bf9\u8f83\u4e3a\u7b28\u62d9\u3002\u662f\u5426\u6709\u6539\u8fdb\u7684\u7a7a\u95f4\u5462\uff1f<\/p>\n
\u5c06Pipe\u6dfb\u52a0\u5230defaultPipeRegistry\u3002<\/h3>\n
\u4ece\u5df2\u6ce8\u518c\u7684defaultPipeRegistry\u4e2d\u63d0\u53d6config\uff0c\u8fd9\u662f\u4e00\u4e2a\u5185\u90e8\u6620\u5c04\uff0c\u5176\u4e2d\u5305\u542bkeyValDiff\u3001iterableDiff\u3001async\u7b49\u5185\u7f6e\u7684Pipe\u3002\u7136\u540e\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u914d\u7f6e\uff0c\u5176\u4e2d\u5d4c\u5165\u81ea\u5b9a\u4e49\u7684Pipe\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4f20\u9012\u7ed9\u6620\u5c04\u7684\u4e0d\u662fPipe\u4e5f\u4e0d\u662fPipeFactory\uff0c\u800c\u662fPipeFactory\u7684\u5217\u8868\u3002\u8fd9\u662f\u4e3a\u4e86\u6309\u4f18\u5148\u987a\u5e8f\u63d0\u53d6\u5177\u6709\u76f8\u540c\u540d\u79f0\u7684PipeFactory\u5217\u8868\u4e2d\u7684\u7b2c\u4e00\u4e2aPipe\u5b9e\u4f8b\uff0c\u5e76\u8c03\u7528supports\u65b9\u6cd5\u4f7f\u7528\u5b83\u3002<\/p>\n
import<\/span> 'package:angular2\/change_detection.dart'<\/span>;<\/span>\r\nimport<\/span> 'double\/double.dart'<\/span>;<\/span>\r\nimport<\/span> 'filter\/filter.dart'<\/span>;<\/span>\r\n\r\ndynamic<\/span> get<\/span> pipes<\/span> {<\/span>\r\n  var<\/span> config<\/span> =<\/span> defaultPipeRegistry<\/span>.<\/span>config<\/span>;<\/span>\r\n  config<\/span>[<\/span>\"double\"<\/span>]<\/span> =<\/span> [<\/span>new<\/span> DoublePipeFactory<\/span>()];<\/span>\r\n  return<\/span> config<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6ce8\u518c\u5e94\u7528\u7a0b\u5e8f<\/h3>\n
\u5728Angular2\u542f\u52a8\u65f6\uff0c\u5c06\u521b\u5efa\u7684\u914d\u7f6e\u6ce8\u518c\u5230\u7ed1\u5b9a\u4e2d\u3002<\/p>\n
import<\/span> \"package:angular2\/src\/reflection\/reflection.dart\"<\/span>;<\/span>\r\nimport<\/span> \"package:angular2\/src\/reflection\/reflection_capabilities.dart\"<\/span>;<\/span>\r\nimport<\/span> 'package:helloworld\/component\/app_component.dart'<\/span>;<\/span>\r\nimport<\/span> 'package:angular2\/di.dart'<\/span>;<\/span>\r\nimport<\/span> 'package:helloworld\/pipe\/pipes.dart'<\/span>;<\/span>\r\n\r\nmain<\/span>()<\/span> {<\/span>\r\n  reflector<\/span>.<\/span>reflectionCapabilities<\/span> =<\/span> new<\/span> ReflectionCapabilities<\/span>();<\/span> \/\/dart\u7248\u3067\u306f\u66ab\u5b9a\u7684\u306b\u5fc5\u8981\u3089\u3057\u3044\u30b3\u30fc\u30c9\u306a\u306e\u3067\u7121\u8996<\/span>\r\n\r\n  var<\/span> injectables<\/span> =<\/span> [<\/span>bind<\/span>(<\/span>PipeRegistry<\/span>).<\/span>toValue<\/span>(<\/span>new<\/span> PipeRegistry<\/span>(<\/span>pipes<\/span>))];<\/span>\r\n\r\n  bootstrap<\/span>(<\/span>AppComponent<\/span>,<\/span> injectables<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7528<\/h1>\n
\u53ea\u8981\u5b8c\u6210\u6ce8\u518c\uff0c\u4e4b\u540e\u5c31\u53ea\u9700\u8981\u4f7f\u7528\u4e86\u3002<\/p>\n
\u5728{{}}\u4e4b\u4e2d\u4f7f\u7528<\/h2>\n
\u6211\u4eec\u5c06\u521b\u5efa\u4e00\u4e2a\u540d\u4e3adouble-value\u7684\u7ec4\u4ef6\uff0c\u5b83\u662f\u4e00\u79cd\u975e\u5e38\u7b80\u5355\u7684\u5f62\u5f0f\u3002\u5b83\u4f1a\u5c06\u6587\u672c\u5c5e\u6027\u7684\u5b57\u7b26\u4e32\u91cd\u590d\u4e24\u6b21\u663e\u793a\u3002<\/p>\n
import<\/span> \"package:angular2\/angular2.dart\"<\/span>;<\/span>\r\nimport<\/span> 'package:helloworld\/component\/double\/double_component.dart'<\/span>;<\/span>\r\n\r\n@Component<\/span>(<\/span>selector:<\/span> 'my-app'<\/span>)<\/span>\r\n@View<\/span>(<\/span>\r\n    templateUrl:<\/span> 'component\/app.html'<\/span>,<\/span>\r\n    directives:<\/span> const<\/span> [<\/span>DoubleComponent<\/span>])<\/span>\r\nclass<\/span> AppComponent<\/span> {<\/span>\r\n  var<\/span> text<\/span> =<\/span> \"ABC\"<\/span>;<\/span>\r\n\r\n  AppComponent<\/span>()<\/span> {}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
<double-value<\/span> [text]=<\/span>\"text\"<\/span>><\/double-value><\/span>\r\n<\/code><\/pre>\n
import<\/span> \"package:angular2\/angular2.dart\"<\/span>;<\/span>\r\n\r\n@Component<\/span>(<\/span>selector:<\/span> \"double-value\"<\/span>,<\/span> properties:<\/span> const<\/span> {<\/span>\"text\"<\/span>:<\/span> \"text\"<\/span>})<\/span>\r\n@View<\/span>(<\/span>templateUrl:<\/span> \"component\/double.html\"<\/span>)<\/span>\r\nclass<\/span> DoubleComponent<\/span> {<\/span>\r\n  String<\/span> text<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
<h2><\/span>Double Pipe<\/h2><\/span>\r\n<span><\/span>{{ text | double }}<\/span><\/span>\r\n<\/code><\/pre>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u6211\u4eec\u5236\u4f5c\u4e86\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u4fbf\u5b9c\u7684\u7ec4\u4ef6\uff0c\u4f46\u5f53\u7136\u4e5f\u53ef\u4ee5\u5728\u6839HTML\u4e2d\u4f7f\u7528\u3002<\/p>\n
\u5728\u5c5e\u6027\u7684\u503c\u4e2d\u4f7f\u7528<\/h2>\n
\u8fd9\u662f\u4e00\u4e2a\u5728\u4f7f\u7528for\u5faa\u73af\u65f6\u7684\u60c5\u5883\u3002\u5728\u5c06\u503c\u4f20\u9012\u7ed9Directive\u4e4b\u524d\uff0c\u4f1a\u5148\u5e94\u7528Pipe\u3002\u5982\u679c\u5c06\u524d\u4e00\u4e2aapp.html\u4fee\u6539\u5982\u4e0b\uff0c\u5f53\u5c06\u503c\u4f20\u9012\u7ed9Directive\u65f6\uff0cPipe\u5c06\u4f1a\u4f5c\u7528\u4e24\u6b21\uff0c\u5206\u522b\u5728\u5185\u90e8\u548c\u5916\u90e8\u3002<\/p>\n
<double-value<\/span> [text]=<\/span>\"text | double\"<\/span>><\/double-value><\/span>\r\n<\/code><\/pre>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u5728Directive\u5b9a\u7fa9\u4e2d\u4f7f\u7528<\/h2>\n
\u7531\u4e8e\u8fd9\u4e2a\u7528\u6cd5\uff0c\u975e\u5e38\u6df7\u4e71\u3002\u8fd9\u662f\u4e00\u79cd\u5728\u811a\u672c\u4e2d\u800c\u4e0d\u662fHTML\u4e2d\u5e94\u7528Pipe\u7684\u8bed\u6cd5\u3002\u5728@Component\u7684properties\u4e2d\u4f7f\u7528\u3002<\/p>\n
\u5f53\u4f20\u9012\u7ed9Directive\u7684\u503c\u88ab\u7ed1\u5b9a\u5230\u5185\u90e8\u5c5e\u6027\u65f6\uff0cPipe\u4f1a\u88ab\u5e94\u7528\u3002\u56e0\u6b64\uff0c\u901a\u8fc7\u4fee\u6539double_component.dart\u5982\u4e0b\uff0c\u53ef\u4ee5\u518d\u6b21\u901a\u8fc7Pipe\u4f20\u9012\u4e00\u6b21\uff0c\u603b\u5171\u53d1\u751f3\u6b21\u91cd\u590d\u3002<\/p>\n
import \"package:angular2\/angular2.dart\";\r\n\r\n@Component(selector: \"double-value\", properties: const {\"text\": \"text | double\"})\r\n@View(templateUrl: \"component\/double.html\")\r\nclass DoubleComponent {\r\n  String text;\r\n  DoubleComponent() : super() {}\r\n}\r\n<\/code><\/pre>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u901a\u8fc7\u5c06\u5c5e\u6027\u7ed1\u5b9a\u5230setter\u51fd\u6570\uff0c\u53ef\u4ee5\u770b\u5230\u7ba1\u9053\u5728\u7ed1\u5b9a\u540e\u4ecd\u5728\u8d77\u4f5c\u7528\uff0c\u5c31\u50cf\u4e0b\u9762\u7684\u4f8b\u5b50\u4e00\u6837\u3002<\/p>\n
import \"package:angular2\/angular2.dart\";\r\n\r\n@Component(\r\n    selector: \"double-value\", properties: const {\"textChange\": \"text | double\"})\r\n@View(templateUrl: \"component\/double.html\")\r\nclass DoubleComponent {\r\n  String text;\r\n\r\n  set textChange(String newText) {\r\n    this.text = newText + \"_\";\r\n  }\r\n\r\n  DoubleComponent() : super() {}\r\n}\r\n<\/code><\/pre>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u5f53\u6536\u5230\u4e0d\u652f\u6301\u7684\u5bf9\u8c61\u65f6\u7684\u884c\u4e3a<\/h1>\n
\u5982\u679c\u5c06\u6570\u5b57100\u4f20\u9012\u7ed9\u53cc\u7ba1\u9053(double Pipe)\uff0c\u90a3\u4e48\u5c06\u4ecePipeRegistry\u7684double\u4e2d\u6ce8\u518c\u7684PipeFactory\u4e2d\u67e5\u627esupports(100) == true\u7684Pipe\uff0c\u5982\u679c\u627e\u4e0d\u5230\uff0c\u5219\u4f1a\u51fa\u73b0\u9519\u8bef\u63d0\u793a\u3002<\/p>\n
Cannot find 'double' pipe supporting object '100' in [text| double in AppComponent]\r\n<\/code><\/pre>\n
\u603b\u7ed3<\/h1>\n
\u73b0\u5728\u8bf4\u4ec0\u4e48\u90fd\u592a\u52c9\u5f3a\u4e86\uff0c\u5bf9\u4e0d\u8d77\uff01
\n\u867d\u7136\u8fd8\u6709\u70b9\u65e9\uff0c\u4f46\u5df2\u7ecf\u5230\u4e86\u53ef\u4ee5\u4f7f\u7528\u7684\u6c34\u5e73\u3002
\n\u7531\u4e8e\u662fDart\u7248\uff0c\u7ec6\u8282\u53ef\u80fd\u4e0eJS\u4e0d\u540c\uff0c\u8bf7\u5c3d\u91cf\u514b\u670d\u8fd9\u4e9b\u56f0\u96be\u3002\u5728Angular2\u7684\u4e16\u754c\u4e2d\uff0cDart\u548cJS\u7684\u533a\u522b\u4e0d\u8fc7\u662f\u5fae\u4e0d\u8db3\u9053\u7684\u4e8b\u60c5\u3002<\/p>\n
\u5e0c\u671b\u672a\u6765\u80fd\u6539\u5584\u7684\u65b9\u9762\u662f<\/p>\n
    \n
  • \n
      PipeRegistry\u5468\u308a\u3082\u3046\u3061\u3087\u3063\u3068API\u6574\u5099\u3057\u3066\u7dba\u9e97\u306b\u66f8\u3051\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u308c<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \u306a\u305cPipeFactory\u306f\u30af\u30e9\u30b9\u304c\u306a\u3044\u306e\u304b\u2026(create\u30e1\u30bd\u30c3\u30c9\u304c\u306a\u3044\u3068\u30c0\u30e1\u3060\u3063\u3066\u3044\u3046\u30a8\u30e9\u30fc\u306f\u51fa\u3059\u304f\u305b\u306b)<\/ul>\n
        \u53ea\u662f\u5927\u7ea6\u8fd9\u6837\u3002<\/p>\n
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