一、前言

众所周知，审查元素的情况下，大家都可以随机更改一部分页面的代码，注入恶意JS等等，这种情况避免也不难，虽然还能看到一部分H5源码，但是无法修改。

二、屏蔽F12 审查元素

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document.onkeydown = function () {

    if (window.event && window.event.keyCode == 123) {
        alert("F12被禁用");
        event.keyCode = 0;
        event.returnValue = false;
    }
    if (window.event && window.event.keyCode == 13) {
        window.event.keyCode = 505;
    }
    if (window.event && window.event.keyCode == 8) {
        alert(str + "\n请使用Del键进行字符的删除操作！");
        window.event.returnValue = false;
    }

}

三、屏蔽右键菜单

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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;
    }
}

四、屏蔽粘贴

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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;
    }
}

五、屏蔽复制

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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;
    }
}

六、屏蔽剪切

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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;
    }
}

这种很适合小说网站，毕竟版权珍贵，被别人随意copy走内容就不好了

七、屏蔽选中

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document.onselectstart = 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;
    }
}