js禁止某些键盘事件

function banKeyEvent() {
    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)
    })
}

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