NodeJS - 如何使用 Javascript 在 HTML 文档中插入元素? [英] NodeJS - How to insert an element in a HTML document using Javascript?
问题描述
我正在尝试使用 NodeJS 修改外部 HTML 文件(位于同一目录中).在我的 index.js 文件中，我写道:
I'm trying to use NodeJS to modify an external HTML file (which is located in the same directory). In my index.js file I write:
fs.readFile('index.html', (err,html)=>{
if(err){
throw err;
}
html.body.innerHTML += '<div id = "asdf"></div>';
});
因为 index.html 是一个有效的文档.但它看起来并没有正确读取它，因为我收到了一个错误:
As index.html is a valid document. But it doesn't look to be reading it properly, as I get as an error:
类型错误:无法读取未定义的属性innerHTML"".
"TypeError: Cannot read property 'innerHTML' of undefined".
我猜 html 没有得到任何东西作为正文.
I guess that html is not getting anything as body.
如何使用 JavaScript 更改 HTML?
How can I do changes in HTML using JavaScript?
推荐答案
这里是一个使用 node-html-parse
HTML 文件
<html>
<body>
<div id="fist">yolo</div>
</body>
</html>
还有 nodejs
const fs = require('fs');
const parse = require('node-html-parser').parse;
fs.readFile('index.html', 'utf8', (err,html)=>{
if(err){
throw err;
}
const root = parse(html);
const body = root.querySelector('body');
//body.set_content('<div id = "asdf"></div>');
body.appendChild('<div id = "asdf"></div>');
console.log(root.toString()); // This you can write back to file!
});
考虑到下载量，可能有比 node-html-parser 更好的解决方案.例如，htmlparser2 的下载量要多得多，但看起来也更复杂 :)
There might be better solutions than node-html-parser, considering the amount of downloads. For example, htmlparser2 has much more downloads, but it also looks more complex :)
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