Question

我正在尝试在承诺解决时在承诺内返回一个值，然后将返回的值传递给我的状态。但是，无论尝试什么，函数的返回值都是不确定的。

我的函数是从npm包中导入的，该包的文档在这里： https://www.npmjs.com/package/synonyms

它旨在返回给定单词的同义词。

在我构造诺言本身的方式上可能会引起一些严重的异步计时吗？

我尝试仅返回该函数而不将其传递给解析，但这会引发错误

searchForSynonymsAndDef = (param) =>{
if(this.state.scholarMode==true){
console.log("INSIDE SYNONYMS")

var synonyms = require("synonyms");

  let p = new Promise((resolve,reject,param)=>{
    var result=resolve(synonyms(param,"n"))

  }).then((result)=>{
    console.log("result is:",result)
  })
  .then((result)=>{
    this.setState({textToReadAloud: "here are some synonyms for "
    +param +"...firstly.....nouns...."+result})
    console.log("here are some synonyms for "+param +"...firstly.....nouns...."+result)
    })
  }else{
    console.log("sorry scholar mode is off")
  }
}

我希望'结果'是基于传入的参数的同义词，但是不幸的是，结果总是= undefined：（

Answer 1

searchForSynonymsAndDef = (param) =>{
    if(this.state.scholarMode==true){
    console.log("INSIDE SYNONYMS")

    var synonyms = require("synonyms");
    let p = new Promise((resolve,reject,param)=>{
        resolve(synonyms(param,"n"));
    });
    return p;
}else{
    console.log("sorry scholar mode is off")
}
}

Answer 2

您无需传递参数即可承诺。只需从Promise中删除参数，它就可以工作。

searchForSynonymsAndDef = (param) =>{
if(this.state.scholarMode==true){
console.log("INSIDE SYNONYMS")

var synonyms = require("synonyms");

  let p = new Promise((resolve,reject)=>{
    var result=resolve(synonyms(param,"n"))

  }).then((result)=>{
    console.log("result is:",result)
  })
  .then((result)=>{
    this.setState({textToReadAloud: "here are some synonyms for "
    +param +"...firstly.....nouns...."+result})
    console.log("here are some synonyms for "+param +"...firstly.....nouns...."+result)
    })
  }else{
    console.log("sorry scholar mode is off")
  }
}

承诺执行函数返回未定义

2 个答案: