在主进程中，通过webContents的did-attach-webview事件监听webview是否加载，再通过webview的webContent去监听will-navigate事件达到拦截的效果

import { BrowserWindow, shell } from 'electron'
const win = new BrowserWindow({ width: 800, height: 600 })
win.webContents.on('did-attach-webview', (event, webContent) => {
    webContent.on('will-navigate', (e, url) => {
        //这里可以根据具体业务，判断是否需要拦截webview中的链接跳转
        e.preventDefault()
        const protocol = require('url').parse(url).protocol
        if (protocol === 'http:' || protocol === 'https:') {
            shell.openExternal(url)
        }
    })
})