禁止右键菜单代码、禁止复制粘贴代码

代码如下：

<script type="text/javascript">
// 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;}
}
// 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;}
}
// 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;}
}
// 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;}
}
// 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;}
}
</script>