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javascript - Rewrite code from Arrow Function to non arrow function

so I want to rewrite this code from an arrow function to a non arrow function, how will this then be done and what will the code be?

require('isomorphic-fetch');

let items = [];

fetch("https://www.googleapis.com/books/v1/volumes?q=isbn:0747532699")
  .then(res => res.json())
  .then((result) => {
    items = result.items;
    console.log(items);
  }),
  (error) => {
    console.log(error);
  }
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by (71.8m points)
require('isomorphic-fetch');

let items = [];

fetch("https://www.googleapis.com/books/v1/volumes?q=isbn:0747532699")
  .then(function(res) { return res.json(); })
  .then(function (result) {
    items = result.items;
    console.log(items);
  }),
  function (error) {
    console.log(error);
  }

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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