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回答

在index.html中添加一个按钮,每按一次从本地读取一次文件:

<button id="btn1">按钮1</button>

修改preload.js:

// preload.js
// All of the Node.js APIs are available in the preload process.
// It has the same sandbox as a Chrome extension.
window.addEventListener('DOMContentLoaded', () => {
省略号
let readAndDisplay = () => {
let fs = require("fs");
fs.readFile('local_file.txt', (err, data) => {
if (err) return console.error(err);
console.log(data.toString());
let myNode = document.createTextNode(data.toString());
document.body.insertBefore(myNode, document.body.firstChild);
});
}

document.querySelector('#btn1').addEventListener("click", event => {
readAndDisplay();
})
省略号
})


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