前端:页面安全问题,从前端角度使用js禁止用户修改页面代码

所周知,审查元素(F12或者右键检查)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;所以我们可以通过一下三种方式解决问题:

1、屏蔽F12 审查元素;
2、屏蔽右键菜单来初步解决这些问题(也就是解决发现问题的人[偷笑]);
3、在页面引用公共脚本使其自动进行JS调试(debug)。

一、屏蔽F12 审查元素

//一、屏蔽F12 审查元素
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;
    }
}

二、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;
    }
}

三、F12自动进行JS调试

((function () {
    var callbacks = [],
        timeLimit = 50,
        open = false;
    var str = /x/
    str.toString = function () {
        window.clearInterval = function () {
            return '不能使用清除定时器了'
        }
        alert('控制台打开')
    }
    setInterval(loop, 1);
    return {
        addListener: function (fn) {
            callbacks.push(fn);
        },
        cancleListenr: function (fn) {
            callbacks = callbacks.filter(function (v) {
                return v !== fn;
            });
        },
    };
    function loop() {
        var startTime = new Date();
        debugger;
        if (new Date() - startTime > timeLimit) {
            if (!open) {
                callbacks.forEach(function (fn) {
                    fn.call(null);
                });
            }
            open = true;
            window.stop();
            console.log(str)
            alert('不要扒我了');
            window.location.reload();
        } else {
            open = false;
        }
    }
})()).addListener(function () {
    window.location.reload();
});

其他屏蔽项

//一、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;
        }
    }

    //二、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;
        }
    }

    //三、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;
        }
    }
    
    //四、屏蔽选中
    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;
        }
    }

热门相关:极品公子   豪门闪婚:帝少的神秘冷妻   薄先生,情不由己   仗剑高歌   仗剑高歌