Electron 弹出框
dialog 模块提供了 api 来展示原生的系统对话框，例如打开文件框，alert 框， 所以 web 应用可以给用户带来跟系统应用相同的体验。 
dialog.showErrorBox('title', 'content')
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dialog.showMessageBox(
{
type: 'info',
title: 'message',
message: 'hello',
buttons: ['ok', 'cancel'],
},
(index) => {
if (index == 0)
console.log('You click ok.')
else
console.log('You click cancel')
},
)
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dialog.showOpenDialog({ properties: ['openFile', 'openDirectory'] }, (files) => {
console.log(files)
})
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dialog.showSaveDialog(
{
title: 'save some file',
filters: [
{ name: 'Images', extensions: ['jpg', 'png', 'gif'] },
{ name: 'Movies', extensions: ['mkv', 'avi', 'mp4'] },
{ name: 'Custom File Type', extensions: ['as'] },
{ name: 'All Files', extensions: ['*'] },
],
},
(filename) => {
console.log(filename)
},
)
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