chrome ,fireFox,IE 屏蔽默认F1 帮助功能,执行自定义操作

/*IE*/
window.onhelp = function () { return false }; 
    document.οnkeydοwn=function (event) {
        var key=event.keyCode;
        if(key==112) {
            event.preventDefault();
            alert("你敲击了F1 ,我屏蔽了它,666");
        }
    }

参考博客地址: https://blog.csdn.net/milaner337/article/details/49835555