JS method to shield shift, Ctrl, alt and other function keys_javascript skills

The example in this article describes the method of blocking shift, Ctrl, alt and other function keys using JS. Share it with everyone for your reference. The specific implementation method is as follows:

<script>
function lock(){ 
if(event.shiftKey) 
 alert("禁止按Shift键!");
} 
if(event.ctrlKey) 
 alert("禁止按Ctrl键!");
}
if(event.altKey) 
 alert("禁止按alt键!"); 
}
document.onkeydown=lock; 
</script>

I hope this article will be helpful to everyone’s JavaScript programming design.