lovecoding
/
VIP32


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839
							<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .box {
        width: 200px;
        height: 200px;
        background: #00f;
        position: absolute;
      }
    </style>
  </head>
  <body>
    <!-- 
        e.clientX	事件发生时，鼠标在客户端区域的X坐标，客户端区域是指页面可视区域
        e.clientY	事件发生时，鼠标在客户端区域的Y坐标
     -->
    <div class="box"></div>
    <script>
        var box = document.querySelector(".box");
        console.log(box.offsetLeft);
        box.onmousedown = function(event) {
            var left1 = event.clientX - box.offsetLeft;
            var top1 = event.clientY - box.offsetTop;
            box.onmousemove = function(event){
                box.style.top = event.clientY - top1 + 'px';
                box.style.left =  event.clientX - left1 + 'px';

            }
        }
        box.onmouseup = function() {
            box.onmousemove = null;
        }
    </script>
  </body>
</html>