Native js realizes the acquisition of shift/ctrl/alt keys_javascript skills

Copy code The code is as follows:

document.onclick = function(e){
alert(getKey (e));
};
function getKey(e){
var e = e || window.event;
var keys = [];

if(e .shiftKey){
keys.push("shift key");
};
if(e.ctrlKey){
keys.push("ctrl key");
};
if(e.altKey){
keys.push("alt key");
};
return keys;
};