实现一个宽和高都是100像素的div可以用鼠标拖拽移动的效果

　　html,body{
        width:100%;height:100%;margin:0px;padding:0px;
    }
    #box{
        width:100px;height:100px;background:pink;position:absolute;
    }

div id="box"></div>

window.onload = function(){
        var box = document.getElementById(‘box‘);   
        box.onmousedown = function(e){     
            var offsetX = e.offsetX;       
            var offsetY = e.offsetY;
        
            document.body.onmousemove = function(e){
                box.style.left = e.pageX-offsetX + ‘px‘;
                box.style.top = e.pageY-offsetY + ‘px‘;
            }
            document.body.onmouseup = function(){
                document.body.onmousemove = null;
                document.body.onmouseup = null;
            }
        }
    }