拖动事件怎么获取拖动的值drag和swipe

怎么动态得到移动和拖动的偏移的参数，使用什么方式可以获取，如下如何获取：
document.getElementById("img-btn").addEventListener("swipeleft",function(){
console.log("向左滑动");
});

    document.getElementById("img-btn").addEventListener("swiperight",function(){  
         console.log("向右滑动");  
    });  

    document.getElementById("img-btn").addEventListener("swipeup",function(){  
         console.log("向上滑动");  
    });  

    document.getElementById("img-btn").addEventListener("swipedown",function(){  
         console.log("向下滑动");  
    });  

    document.getElementById("img-btn").addEventListener("dragstart",function(){  
         console.log("开始拖动");  
    });  

    document.getElementById("img-btn").addEventListener("drag",function(e){  
         console.log("拖动中");  
    });  

    document.getElementById("img-btn").addEventListener("dragend",function(e){  
        console.log("拖动结束"+e.detail.center.x);  
    });