setTimeout 不起作用

Question

我正在使用 Ember-Simple-Auth 来根据远程服务器验证我的应用程序，远程服务器为我提供 API 令牌，必须通过使用更新令牌每 30 分钟刷新一次.为此，我包含了对 ember-Simple-Auth 恢复方法的异步调用，该方法实现了令牌刷新，应该使用 setTimeout 每 25 分钟触发一次。然而，在对 setTimeout 的三个调用中，只有一个正常工作，尽管对我来说它们看起来都是一样的。你能不能在这件事上帮助我？

示例代码：

export default Base.extend({
   restore(data) {
     console.log("restoring");
     var renewDelay = 30000; //set to 30 seconds for testing purpose
     var expirates = data.expirates * 1000;  //server response lists expiration as a unix timestamp in seconds
     var current = new Date().getTime();

     if (expirates < current) {
       console.log("token expired " + expirates + " " + current);
       return Ember.RSVP.reject();
     } else {
       if (expirates - current > renewDelay / 4) {
         console.log("token valid " + expirates + " " + current + ", renew in " + Number(expirates - current - 30000));
         //this one works as expected after 30s
         setTimeout(this.restore, expirates - current - renewDelay, data); 
         return Ember.RSVP.resolve(data);
       } else {
         console.log("token valid " + expirates + " " + current + ", renewing now");
         return Ember.$.ajax({
           method: "GET",
           url: "/renew",
           accepts: 'application/json',
           headers: {
             Authorization: data.renew_token
           }
         })
         .then(function(data) {
           console.log("next renew in " + Number((data.expirates * 1000) - current - renewDelay));
           //this one is never called
           setTimeout(this.restore, (data.expirates * 1000) - current- renewDelay, data); 
           return data;
         });
       },
     },
   authenticate(identification, password) {
   console.log("authenticating");
   return Ember.$.ajax({
    method: "POST",
    url: "/auth",
     contentType: 'application/json',
     accepts: 'application/json',
     data: JSON.stringify({ username: identification, password: password })
   })
   .then(function(data) {
     console.log("next renew in " + Number((data.expirates * 1000) - new Date().getTime() - 30000));
      //this one is not triggered either
     setTimeout(this.restore, (data.expirates * 1000) - new Date().getTime() - 30000, data);
     return data;
   });
 }
});

Answer 1

尝试简化您的代码。

试试这个：

var timeOutDelay  = expirates  - current- renewDelay;
setTimeout(restore, timeOutDelay, data);

Answer 2

您在两个回调中的 this.restore 可能引用了错误的 this，导致永远不会调用恢复函数。您是否尝试过调试 this 所指的内容？使用箭头回调可以解决这个问题，比如

.then((data) => {
    ...
    setTimeout(this.restore, (data.expirates * 1000) - new Date().getTime() - 30000, data);

});

setTimeout 不起作用

setTimeout doesn’t work

javascript

ember.js

ember-simple-auth