René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"关于questionnaire-item.component的ngOnChanges","articleBody":"github上代码\r\n```\r\n  ngOnChanges(changes: SimpleChanges){\r\n      let questionnaireChange = changes['questionnaire'];\r\n      if(questionnaireChange.previousValue.state \u0026\u0026 \r\n            questionnaireChange.currentValue.state !== questionnaireChange.previousValue.state){\r\n          this.questionnaire = changes['questionnaire'].currentValue;\r\n          this.setState();\r\n      }\r\n  }\r\n```\r\n官网PAI\r\n```\r\n\r\nclass SimpleChange {\r\nconstructor(previousValue: any, currentValue: any, firstChange: boolean)\r\npreviousValue : any\r\ncurrentValue : any\r\nfirstChange : boolean\r\nisFirstChange() : boolean\r\n}\r\n```\r\n通过changes为SimpleChanges的一个对象实例，那么应该不具有questionnaire方法吧?表示那不大理解，像老师请教一下。","author":{"url":"https://github.com/clfeng","@type":"Person","name":"clfeng"},"datePublished":"2017-06-21T13:52:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/13/angular2-questionnaire/issues/13"}