electronjs ipc doesn 27t work

1
2//index
3mainWindow.webContents.on('did-finish-load', () => {
4      mainWindow.webContents.send('test','This is a test');
5    })
6//render
7
8ipcRenderer.on('test', (evt,data) => {
9     ipcRenderer.emit('end',true);
10})
11