禁止网页右键

function click(e) {
if (document.all) {
  if (event.button==1||event.button==2||event.button==3) {
   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;")

var travel=true
var hotkey=17   /* hotkey即为热键的键值,是ASII码,这里99代表c键 */
if (document.layers)
document.captureEvents(Event.KEYDOWN)
function gogo(e)
{ if (document.layers) {
if (e.which==hotkey&&travel){
alert("操作错误.或许是您按错了按键!");  } }
else if (document.all){
if (event.keyCode==hotkey&&travel){ alert("操作错误.或许是您按错了按键!"); }}
}

document.onkeydown=gogo