js prohibits right-clicking on the page (simple sample code)_javascript skills

JS code that prohibits right-clicking:

Copy code The code is as follows:

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;")