원했던 건 우클릭하면 바로 복사 하려고 하였으나,
왜 그런지 document.execCommand("copy"); 가 동작하지 않는다.
그래서 click 이벤트로 발생하기 위해 '복사'div 를 생성하였다.
	function copyToClipboard(value, showNotification, notificationText) {
	    var $temp = $("<input>");
	    $("body").append($temp);
	    $temp.val(value).select();
	    document.execCommand("copy");
	    $temp.remove();
	    if (typeof showNotification === 'undefined') {
	        showNotification = true;
	    }
	    if (typeof notificationText === 'undefined') {
	        notificationText = "Copied to clipboard";
	    }
	    var notificationTag = $("div.copy-notification");
	    if (showNotification && notificationTag.length == 0) {
	        notificationTag = $("<div/>", { "class": "copy-notification", text: notificationText });
	        $("body").append(notificationTag);
	        notificationTag.fadeIn("slow", function () {
	            setTimeout(function () {
	                notificationTag.fadeOut("slow", function () {
	                    notificationTag.remove();
	                });
	            }, 10);
	        });
	    }
	}
	var copyData = "";
	//$(".context-menu-one").on("contextmenu", function(event) {
	$("table").on("contextmenu", function(event) {
		event.preventDefault();
		$("div.custom-menu").remove();
		copyData = $.trim(event.target.textContent);
	    
	    $("<div class='custom-menu'>복사</div>")
	        .appendTo("body")
	        .css({top: event.pageY + "px", left: event.pageX + "px"})
	        .on("click", function(event) {
		    event.preventDefault();
		    copyToClipboard(copyData);
		    copyData = "";
		    $("div.custom-menu").remove();
			});
		$("body").click(function (){
			 $("div.custom-menu").remove();
		});
	});
	
/* 우측 클릭 '복사' */
.custom-menu {
z-index:1000;
position: absolute;
background-color:#C0C0C0;
border: 1px solid black;
padding: 2px;
border-radius: 5px;
}
.copy-notification {
color: #ffffff;
background-color: rgba(0,0,0,0.8);
padding: 20px;
border-radius: 30px;
position: fixed;
top: 50%;
left: 50%;
width: 150px;
margin-top: -30px;
margin-left: -85px;
display: none;
text-align:center;
}
참조
