SpletSecond, define the onFulfilled and onRejected functions. Third, get the promise from the getUsers() function and call the then() method with the onFulfilled and onRejected … Splet15. okt. 2024 · The then() method returns a Promise. It takes up to two arguments: callback functions for the success and failure cases of the Promise. Promises can be chained one …
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Splet有关promise的实现,首先需要了解promise是如何使用的,需要对promise的调用关系很熟悉。第一版,实现了then方法,以及resolve,reject等,关于promise 内部状态的改变, … SpletUse the then function to access the eventual result of a promise (or, if the operation fails, the reason for that failure). Regardless of the state of the promise, the call to then is non … chris cuomo today 2021
从零开始手写Promise - 知乎 - 知乎专栏
SpletonFulfilled 可选 当 Promise 变成接受状态(fulfilled)时调用的 函数 。 该函数有一个参数,即接受的最终结果(the fulfillment value)。 如果该参数不是函数,则会在内部被替 … Splet18. feb. 2024 · onFulfilled () will be called after the promise is fulfilled, with the promise’s value as the first argument. onRejected () will be called after the promise is rejected, with … Spletthen 方法中,创建并返回了新的 Promise 实例,这是串行Promise的基础,是实现真正链式调用的根本; then 方法传入的形参 onFulfilled 以及创建新 Promise 实例时传入的 resolve … gen sir john mccoll