禁止查看网页源码

window.onload = function() {
    document.onkeydown = function() {
        var e = window.event || arguments[0];
        //屏蔽F12
        if (e.keyCode == 123) {
            return false;
            //屏蔽Ctrl+Shift+I
        } else if ((e.ctrlKey) && (e.shiftKey) && (e.keyCode == 73)) {

            return false;
            //屏蔽Shift+F10
        } else if ((e.shiftKey) && (e.keyCode == 121)) {

            return false;
        }
    };
    //屏蔽右键单击
    document.oncontextmenu = function() {

        return false;
    }
}