为什么 Electron 没有运行我的预加载脚本? [英] Why is Electron not running my preload script?
问题描述
我正在尝试使用 预加载脚本 来解决 CORS 标头问题 在 Electron 4.2.3 中.但是，我无法运行预加载脚本.最小复制案例:
I'm trying to use a preload script to work around a CORS header issue in Electron 4.2.3. However, I can't get the preload script to run. A minimal reproduction case:
package.json
{
"name": "your-app",
"version": "0.1.0",
"main": "main.js",
"dependencies": {
"electron": "^4.2.3"
}
}
main.js
const { app, BrowserWindow } = require('electron')
app.on('ready', function() {
const win = new BrowserWindow({
webPreferences: {
preload: `file://${__dirname}/preload.js`,
}
})
win.webContents.openDevTools()
win.loadFile('index.html')
})
preload.js
window.preloadWasRun = 'preload was run'
index.html
<body>
<script>
document.write(window.preloadWasRun || 'preload was not run')
</script>
</body>
无论我对 webSecurity、nodeIntegration 和 contextIsolation 使用什么设置，似乎我的 preload 脚本只是被忽略了.即使我在脚本中出现语法错误，它也不会在任何地方显示任何错误.
No matter what settings I use for webSecurity, nodeIntegration and contextIsolation, it seems that my preload script is just getting ignored. Even if I make a syntax error in the script, it doesn't show any errors anywhere.
推荐答案
原来它必须是绝对路径名，而不是绝对 URL.这些都不起作用:
Turns out it has to be an absolute path name, not an absolute URL. None of these work:
preload: `file://${__dirname}/preload.js`,
preload: './preload.js',
preload: 'preload.js',
但这就像宣传的那样:
preload: `${__dirname}/preload.js`,
由于它似乎是文件系统路径而不是 URL，因此使用 path.join 来代替具有奇怪路径分隔符的平台可能是明智的:
Since it seems to be a filesystem path rather than a URL, it might also be wise to use path.join instead, to account for platforms with weird path separators:
preload: path.join(__dirname, 'preload.js'),
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