WebAug 23, 2024 · The initial promise resolves in 1 second (*), Then the .then handler is called (**), which in turn creates a new promise (resolved with 2 value). The next then (***) gets the result of the previous one, processes it (doubles) and passes it … WebDec 15, 2024 · Promise states 2. result – This property can have the following values: undefined: Initially when the state value is pending. value: When resolve (value) is called. error: When reject (error) is called. These internal properties are code-inaccessible but they are inspectable.
Promise - JavaScript MDN - Mozilla Developer
WebMar 14, 2024 · Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'data') 这个错误消息表明在执行代码时发生了一个错误,该错误导致无法读取未定义的属性。. 这通常是因为您尝试访问了一个未定义的变量或对象的属性。. 为了解决这个错误,您需要找出导致错误的 ... WebApr 24, 2024 · 3 Answers. Because you've chained several promises together and one of your .then () handlers returns nothing. .then ( (result) => { console.log ('hello'); // since … the sixfold
vue Uncaught (in promise) TypeError: Cannot read properties of ...
WebBy definition, a promise is an objectthat encapsulates the result of an asynchronous operation. A promise object has a state that can be one of the following: Pending Fulfilled with a value Rejected for a reason In the beginning, the state of a promise is pending, indicating that the asynchronous operation is in progress. WebApr 8, 2024 · If the promise has already been fulfilled or rejected when a corresponding handler is attached, the handler will be called, so there is no race condition between an asynchronous operation completing and its handlers being attached. A promise is said to be settled if it is either fulfilled or rejected, but not pending. WebAug 1, 2024 · When the promise is created, its state is set to “pending” and its result is “undefined.” If the request is successful, axios will call its built-in solve() callback to set the promise’s ... myo app download