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5. 实现 Promise.prototype.catch #5

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Sunny-117 opened this issue Nov 3, 2022 · 1 comment

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Sunny-117 commented Nov 3, 2022

 /**
   * 本质就是then，只是少传了一个onFulfilled
   * 所以仅处理失败的场景
   * @param {*} onRejected
   */
Promise.prototype.catch = function(onRejected) {
    return this.then(null, onRejected);
}

cscty commented Jun 18, 2023

Promise.prototype.catch = function (fn) {
this.then(undefined, (err) => {
fn(err);
});
};

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