绑定（这）不工作在ajax成功函数

Question

在react组件挂载之前，我执行ajax请求以了解用户是否登录。

它应该在响应返回状态代码200时设置状态。
我是否错误地使用了bind(this)？

componentWillMount: function(){
  $.ajax({
     url: "/is_signed_in",
     method: "GET",
     dataType: "json"
  }).success(function(response){
    this.setState({ signedIn: response.signed_in, currentUser: $.parseJSON(response.current_user) });
  }.bind(this));
},
componentDidMount: function(){
  console.log(this.state.signedIn);
}

编辑01

R…s.c…s.Constructor {props: Object, context: Object, state: Object, refs: Object, _reactInternalInstance: ReactCompositeComponentWrapper}_reactInternalInstance: ReactCompositeComponentWrapper_context: Object_currentElement: ReactElement_instance: ReactClass.createClass.Constructor_isOwnerNecessary: false_isTopLevel: false_mountImage: null_mountIndex: 0_mountOrder: 2_pendingCallbacks: null_pendingElement: null_pendingForceUpdate: false_pendingReplaceState: false_pendingStateQueue: null_renderedComponent: ReactCompositeComponentWrapper_rootNodeID: ".0"_warnedAboutRefsInRender: false__proto__: ReactCompositeComponentWrappercontext: Object__proto__: Object__defineGetter__: __defineGetter__()__defineSetter__: __defineSetter__()__lookupGetter__: __lookupGetter__()__lookupSetter__: __lookupSetter__()constructor: Object()hasOwnProperty: hasOwnProperty()isPrototypeOf: isPrototypeOf()propertyIsEnumerable: propertyIsEnumerable()toLocaleString: toLocaleString()toString: toString()valueOf: valueOf()get __proto__: get __proto__()set __proto__: set __proto__()getDOMNode: ()__reactBoundArguments: null__reactBoundContext: ReactClass.createClass.Constructor__reactBoundMethod: ()arguments: (...)bind: (newThis )caller: (...)length: 0name: ""__proto__: ()[[TargetFunction]]: ()[[BoundThis]]: ReactClass.createClass.Constructor[[BoundArgs]]: Array[0]props: Objectrefs: Object__proto__: ObjectrenderButtonSet: ()setSignedIn: ()__reactBoundArguments: null__reactBoundContext: ReactClass.createClass.Constructor__reactBoundMethod: setSignedIn(response)arguments: (...)caller: (...)length: 1name: "setSignedIn"prototype: setSignedIn__proto__: ()<function scope>arguments: (...)bind: (newThis )arguments: (...)caller: (...)length: 1name: ""prototype: boundMethod.bind__proto__: ()<function scope>caller: (...)length: 1name: ""__proto__: ()[[TargetFunction]]: setSignedIn(response)[[BoundThis]]: ReactClass.createClass.Constructor[[BoundArgs]]: Array[0]state: ObjectcurrentUser: Objectcreated_at: "2015-07-24T18:30:38.772+09:00"email: "[e-mail]"facebook_account_url: nullfirstName: "유찬"github_account_url: nullgoogleplus_account_url: nullid: 1lastName: "서"linkedin_account_url: nullsns_avatar: nulltwitter_account_url: nullupdated_at: "2015-08-14T02:14:21.091+09:00"__proto__: ObjectsignedIn: true__proto__: Object__proto__: ReactClassComponent

Answer 1

我认为您不应该在ComponentWillmount中使用setState的Ajax调用；在ComponentDidMount中进行。

如果您不想在获得数据之前进行第一次呈现，而这些数据只是用于初始化，请在外部执行调用，并在成功时使用获取的数据呈现视图=====>

<Myview data={initialDataFromTheCallSuccess} /> and then put it in getInitialState

如果选择此路径，请阅读以下内容（如文档中所述，在某些条件下，此路径不是反模式）：https://facebook.github.io/react/tips/props-in-getInitialState-as-anti-pattern.html

希望能有所帮助

编辑：有两种方法可以做到这一点，第一种方法是从react类之外获取

  $.ajax({...}).success(function(res) {
      <MyView data={res} /> // render your function on success
  });

在MyView中，您可以从道具“data”中获得InitialState。只有在需要调用get一次时才使用此方法（阅读反模式的内容）。