• 禁止F12

//禁止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;
    }
}

• 屏蔽右键菜单

//禁止右键
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;
    }
}

• 禁止选中

//禁止选中
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;
    }
}

• 禁止复制

//禁止复制
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;
    }
}

• 禁止剪切

//禁止剪切
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;
    }
}

• 禁止粘贴

//禁止粘贴
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;
    }
}