原生js实现div拖拽

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十分简单的效果。

<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8">

        <style>

            body{

                height:1200px;

                background-color: azure;

            }

            #drag{

                background-color: cornflowerblue;

                border: 1px solid black;

                position: absolute;

                width: 100px;

                height: 100px;

            }

        </style>

    </head>

    <body>

        <div id="drag">

        </div>

        <script>

            //加入文字之后拖拽容易出现选中字后跳动bug

            var drag = document.getElementById("drag"),

                flag ;

            drag.addEventListener("mousedown",dragDiv,false);

            function dragDiv(e){

                flag = true;

                var x=e.layerX||e.offsetX;

                var y=e.layerY||e.offsetY;

                document.addEventListener("mousemove",docMove,false);

                document.addEventListener("mouseup",function(){

                    flag = false;

                },false);

                function docMove(e){

                    if(flag){

                        e.preventDefault;

                         var l =parseInt(drag.style.left);

                         var t =parseInt(drag.style.top);

                         drag.style.left = -x+e.pageX+"px";

                         drag.style.top = -y+e.pageY +"px";

                         console.log(drag);

                    }

                }

            }

        </script>

    </body>

</html>