preload 挂载到Window上

src/background.js

@@ -46,6 +46,7 @@ async function createWindow() {
       // nodeIntegration: process.env.ELECTRON_NODE_INTEGRATION,
       // contextIsolation: !process.env.ELECTRON_NODE_INTEGRATION,
       nodeIntegration: true, //web开启主进程中集成node
+      // 在独立JavaScript环境中运行Electron API和指定的preload脚本
       contextIsolation: false,
       preload: path.join(__dirname, 'preload.js')
     },

src/preload.js

+const fs = require('fs');
+const { clipboard }  = window.require('electron');
 
+// 挂载到Window上供其调用
 
-const { clipboard }  = window.require('electron');
-// https://revolutionary.jkxuetang.com/download?path=C6EDPYre%2Bvu%2B10Ub4uYjYZEPJYjKE46z4wma6JUAOsvvm2Ki4ypAeInpzQXufiOx0ObQDs4usDE8WBNJ51cepu0IOqQ02vOCnT4H03JX0Y45hFe2GGOhuj%2F%2Fog0AkB8q3kMKNvuohAzcMeY0JI%2FYSV0a59JlYJqJ28cGJsE6r%2FfBeWI&name=C6tQONWE%2FPyixkIfoew9&corpid=B%2FNWbYuG9fm1zEMb%2FutiPb8xYJXxS8uusDKF6g&t=D%2FdXbtbfqf7nlQJcpug7fstM
\ No newline at end of file
+const JSBridge = {
+  // 只提供读取方法，不提供写入
+  readFile: (path) => {
+    return new Promise((resolve,reject)=>{
+      // 做一些路径规则判断，是否允许访问
+      if(!/^[a-zA-Z]:[\\]((?! )(?![^\\/]*\s+[\\/])[\w -]+[\\/])*(?! )(?![^.]*\s+\.)[\w -]+$/.test(path)) reject(new Error(`not allowed path ${path}`))
+      fs.readFile(path, (err, data)=>{
+        if(err) reject(err)
+        resolve(data)
+      })
+    })
+  }
+}
+window.JSBridge = JSBridge