禁止网页右键功能

<!-- 禁止保存网页代码 -->
<noscript><iframe src="*.html"></iframe>></noscript>
<script>
//禁止右键复制选择功能
document.onselectstart=function(){return false;}
document.oncontextmenu=function(){return false;}
document.onmousedown=function(){if(event.button==2)return false;}
document.onkeydown=function(){if(event.ctrlKey)return false;}
</script>