JSDOM 未加载包含在 <script> 标签中的 JavaScript

Question

注意：这个问题不是其他现有问题的重复，因为这个问题不使用 jsdom.env() 旧版本 JSDOM 使用的函数调用。

文件bar.js:

console.log('bar says: hello')

文件foo.js:

var jsdom = require('jsdom')
var html = '<!DOCTYPE html><head><script src="bar.js"></script></head><body><div>Foo</div></body>'
var window = new jsdom.JSDOM(html).window
window.onload = function () {
  console.log('window loaded')
}

当我运行 foo.js 时，我得到了这个输出。

$ node foo.js
window loaded

为什么bar says: hello输出没有来？看起来 bar.js 没有加载。如何让 jsdom 加载 script 标签中的文件？

[EDIT/SOLUTION]: 按照 Quentin 的回答中的建议解决了问题。此代码有效：

var jsdom = require('jsdom')
var html = '<!DOCTYPE html><head><script src="bar.js"></script></head><body><div>Foo</div></body>'
var window = new jsdom.JSDOM(html, { runScripts: "dangerously", resources: "usable" }).window
window.onload = function () {
  console.log('window loaded')
}

Answer 1

转到 the JSDOM homepage。

浏览标题，直到找到标有 Executing scripts

的标题

To enable executing scripts inside the page, you can use the runScripts: "dangerously" option:
const dom = new JSDOM(`<body>
  <script>document.body.appendChild(document.createElement("hr"));</script>
</body>`, { runScripts: "dangerously" });

// The script will be executed and modify the DOM:
dom.window.document.body.children.length === 2;
Again we emphasize to only use this when feeding jsdom code you know is safe. If you use it on arbitrary user-supplied code, or code from the Internet, you are effectively running untrusted Node.js code, and your machine could be compromised.

If you want to execute external scripts, included via <script src="">, you'll also need to ensure that they load them. To do this, add the option resources: "usable" as described below.

Answer 2

鉴于我无法从上面的代码中重现基于 url 的解决方案...

残酷的捆绑替代方案：全部内联！

读取各种 .js 文件，将它们作为字符串注入 html 页面。然后像在普通导航器中一样等待页面加载。这些库已加载到 _window = new JSDOM(html, { options }).window; 中，因此可用于您的节点脚本。

这可能会阻止您进行 xhr 调用，因此只能部分解决问题。

say-hello.js

// fired when loaded
console.log("say-hello.js says: hello!")
// defined and needing a call
var sayBye = function(name) { 
    var name = name ||'Hero!'; 
    console.log("say-hello.js says: Good bye! "+name)
}

main.js:

    const fs    = require("fs");
    const jsdom = require("jsdom");
    const { JSDOM } = jsdom;
    
    var NAME  = process.env.NAME; // variable from terminal

    var html = '<!DOCTYPE html><head></head><body><div>Foo</div></body>'
    var _window = new JSDOM(html, {
        runScripts: "dangerously",
        resources: "usable" }).window;
    /* ************************************************************************* */
    /* Add scripts to head ***************************************************** */
    var jsFiles = [
        'say-hello.js'
    ];
    var scriptsContent = ``;
    for(var i =0; i< jsFiles.length;i++){
        console.log(__dirname + '/'+ jsFiles[i])
      let scriptContent = fs.readFileSync( jsFiles[i], 'utf8');
      scriptsContent = scriptsContent + `
      /* ******************************************************************************************* */
      /* `+jsFiles[i]+` **************************************************************************** */
      `+scriptContent;
    };
    let scriptElement = _window.document.createElement('script');
    scriptElement.textContent = scriptsContent;
    _window.document.head.appendChild(scriptElement);


/* ************************************************************************* */
/* Run page **************************************************************** */
_window.document.addEventListener('DOMContentLoaded', () => {
    console.log('main says: DOMContentLoaded')
    // We need to delay one extra turn because we are the first DOMContentLoaded listener,
    // but we want to execute this code only after the second DOMContentLoaded listener
    // (added by external.js) fires.
    _window.sayBye(NAME); // prints "say-hello.js says: Good bye!"

  });

运行它：

NAME=John node main.js    # expects hello and good bye to john messages

来源：

Answer 3

根据 source，使用 JSDOM 选项 url : file://${__dirname}/index.html 可能有效。如果您测试它，请在此处报告结果。

JSDOM 未加载包含在 <script> 标签中的 JavaScript

JSDOM is not loading JavaScript included with <script> tag

javascript

node.js

jsdom

残酷的捆绑替代方案：全部内联！