网页屏蔽f12、右键菜单等操作

1、屏蔽f12

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;
    }
}

2、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;
    }
}

3、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;
    }
} 

4、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;
    }
} 

5、屏蔽剪贴

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;
    }
} 

6、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;
    }
}