or 自己改
1. Launch "System Preferences"
2. Click the "Keyboard & Mouse" icon
3. Select "Keyboard Shortcuts" tab
4. Hit the little "+" button under the main white area
5. In the little pup-up window select "Google Chrome" as the Application
6. Type in "Reload This Page" in the "Menu Title" field exactly as it appears in the Chrome's View menu (no quotes of course)
7. Click inside the "Keyboard Shortcut" field and hit F5 key (or any desired combination)
8. Restart Chrome to make it work