iframe 禁止鼠標右鍵代碼 如何寫？拜托各位了 3Q

<!--禁止鼠標右鍵代碼--> <noscript><iframe src=*.html></iframe></noscript> <script language=javascript> <!-- if (window.Event) document.captureEvents(Event.MOUSEUP); function nocontextmenu(){ event.cancelBubble = true event.returnValue = false; return false; } function norightclick(e){ if (window.Event){ if (e.which == 2 || e.which == 3) return false; } else if (event.button == 2 || event.button == 3){ event.cancelBubble = true event.returnValue = false; return false; } } document.oncontextmenu = nocontextmenu; // for IE5+ document.onmousedown = norightclick; // for all others //--> </script>