在javascript/mocha中,如何等待函数返回值,然后再将其分配给变量

您可以使用 async 和 await 操作员。

 it.only('verify Lot in CFR List',async function(done)){
    this.timeout(20000);
    var result = await ui.cfrVerifyLot();
      console.log(result); // 'getting undefined' 'expecting success or failed'
      if(result=='success'){
        done();
      }
    });
    }

编辑 你的 cfrVerifyLot 作用 returns 没有价值。相反 result 从返回 pupperteer . 更改 puperteer's 然后使用链条 等候 所以您返回 后果 值直接来自函数。

cfrVerifyLot:async function(){

    var result = '';
    const rest = require('./restAPI');
    const puppeteer = require('puppeteer');
    const assert = require('chai').assert;
    const cfg = require('../config-env.json');
    const objR = require('../obj-repo/obj-c.json');
    let browser = await puppeteer.launch({//headless:false})
     /*
    making some UI navigations
    */
    try{
    const innerText = await page.evaluate(() => document.querySelectorAll('some element name')[1].innerText);
    var str = innerText.substring(0,8);
    await page.waitFor(2*1000);
    if(str===input_lot_number){
      result = 'success'
      }          
    }
    catch(err){
      result = 'failed'  
    }
    finally{
      await browser.close();
      return result
    }  
},