**禁止某些键盘事件**
```language
    document.addEventListener('keydown', function(event){
        return !(
            112 == event.keyCode || //F1
            123 == event.keyCode || //F12
            event.ctrlKey && 82 == event.keyCode || //ctrl + R
            event.ctrlKey && 78 == event.keyCode || //ctrl + N
            event.shiftKey && 121 == event.keyCode || //shift + F10
            event.altKey && 115 == event.keyCode || //alt + F4
            "A" == event.srcElement.tagName && event.shiftKey //shift + 点击a标签
        ) || (event.returnValue = false)
    });
```

**禁止右键、选择、复制**
```language
    ['contextmenu', 'selectstart', 'copy'].forEach(function(ev){
        document.addEventListener(ev, function(event){
            return event.returnValue = false
        })
    });
```