JS实现右键拖动元素

最近做一个绘图的应用，需要用右键来拖动画布的父节点，网上的例子一般是左键拖动，我稍微改了一下，使用右键拖动，拖动前需要屏蔽右键触发上下文菜单：

//需要拖动的块



		var drag = document.getElementById('Container');
        //屏蔽此对象的右键菜单
		drag.oncontextmenu = () => false;
       	let putDown = function (event) {
       		var event = event || window.event;
       		if(event.button != 2){return;}
       		drag.style.cursor = "move";
            let offsetX = parseInt(drag.style.left); // x轴距离
            let offsetY = parseInt(drag.style.top); // y轴距离
            let innerX = event.clientX - offsetX; // 鼠标x轴距
            let innerY = event.clientY - offsetY; // 鼠标y轴距
            // 移动时显示边框
            drag.style.borderStyle = "solid";
            drag.style.borderColor = "white";
            drag.style.borderWidth = "2px";
            document.onmousemove = function (event) {
         	   drag.style.left = event.clientX - innerX + "px";
         	   drag.style.top = event.clientY - innerY + "px";
            }
            document.onmouseup = function () {
            	var event = event || window.event;
            	if(event.button != 2){return;}
                document.onmousemove = null;
                document.onmouseup = null;
                drag.style.borderStyle = "";
                drag.style.borderColor = "";
                drag.style.borderWidth = "";
                drag.style.cursor = "auto";
            }
           }
        drag.addEventListener("mousedown", putDown, false);