How to restrict the use of right-click in a form_form effects

<table id="t1" width="200" height="100" style="background-color:red;text-align:center;vertical-align:middle;" onmouseover="stop()"> <tr> <td>点击右键</td> </tr> </table>
[Ctrl A to select all Note: If you need to introduce external Js, you need to refresh to execute

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<table border oncontextmenu="return(false)"><td>no</td></table>
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<script> function stop(){ return false; } document.getElementById("t1").oncontextmenu=stop; </script>