如何实现网站禁止右键功能

在html里添加js代码可以实现鼠标右键禁用

• 禁止点鼠标右键

<script language = "JavaScript" >
function click() {
    if (event.button == 2) {
        alert('你好,右键已被禁止使用');
    }
}
document.onmousedown = click 
</script>

• 锁鼠标右键和键盘CONTEXTMENU键

<script language = "JavaScript" > 
function click(e) {
    if (document.all) {
        if (event.button == 2 || event.button == 3) {
            alert("欢迎光临知心朋友，有什么需要帮忙的话，请与站长联系！谢谢您的合作！！！");
            oncontextmenu = 'return false';
        }
    }
    if (document.layers) {
        if (e.which == 3) {
            oncontextmenu = 'return false';
        }
    }
}
if (document.layers) {
    document.captureEvents(Event.MOUSEDOWN);
}
document.onmousedown = click;
document.oncontextmenu = new Function("return false;")
</script>

• 锁鼠标右键和键盘Ctrl+C键

<script  language = "JavaScript"> 
document.oncontextmenu = function() {
    return false;
}
document.onkeydown = function() {
    if (event.ctrlKey && window.event.keyCode == 67) {
        return false;
    }
}
document.body.oncopy = function() {
    return false;
}
document.onselectstart = function() {
    //return false; 
} </script>