禁用F12和鼠标右键，防止查看控制台代码

虽然是个治标不治本的办法，还是挺有用的（对Opera无效，Opera开始控制台是Ctrl+Shift+C)

在禁用同时，自身的代码健壮性也需要加强

// 屏蔽F12
document.onkeydown = function () {
    //f12键
    if (window.event && window.event.keyCode == 123) {
        event.keyCode = 0;
        event.returnValue = false;
    }
    // enter键
    // if (window.event && window.event.keyCode == 13) {
    //     window.event.keyCode = 505;
    // }
    // backspace键
    // if (window.event && window.event.keyCode == 8) {
    //     alert(str + "
请使用Del键进行字符的删除操作！");
    //     window.event.returnValue = false;
    // }
};

// 屏蔽右键菜单 
document.oncontextmenu = function (event) {
    if (window.event) {
        event = window.event;
    }
    try {
        var the = event.srcElement;
        if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")) {
            return false;
        }
        return true;
    } catch (e) {
        return false;
    }
};

// 屏蔽粘贴
document.onpaste = function (event) {
    if (window.event) {
        event = window.event;
    }
    try {
        var the = event.srcElement;
        if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")) {
            return false;
        }
        return true;
    } catch (e) {
        return false;
    }
};

// 屏蔽复制
document.oncopy = function (event) {
    if (window.event) {
        event = window.event;
    }
    try {
        var the = event.srcElement;
        if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")) {
            return false;
        }
        return true;
    } catch (e) {
        return false;
    }
};

// 屏蔽剪切
document.oncut = function (event) {
    if (window.event) {
        event = window.event;
    }
    try {
        var the = event.srcElement;
        if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")) {
            return false;
        }
        return true;
    } catch (e) {
        return false;
    }
};