js,jquery实现元素鼠标拖拽

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <title>Document</title>

    <style>

        body{

            padding-bottom: 20px;

        }

        .class1{

            width: 300px;

            height: 300px;

            border: 1px solid red;

            position: relative;

            text-align: center;

            line-height: 300px;

            background-color: orange

        }

      .class-resize{

          cursor: col-resize;

      }

    </style>

    <script src="https://cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>



</head>

<body>

    <!-- <div style="width:1000px;border: 1px solid green"> -->

            <div id='d1' class="class1 clearfix"><div class="pox">改变宽高</div></div>

    <!-- </div> -->



    <script>

        $().ready(function(){

            // var originPositionX;

            // var originPositionY;

            var downPositonX;

            var downPositonY;

            var canResize = false;



            $('#d1').on('mousedown',function(e){

                if($('#d1').hasClass('class-resize')){

                    canResize = true;

                }

                downPositonX = event.clientX;  //鼠标按下位置x

                downPositonY = event.clientY;  //鼠标按下位置y

                // originPositionX = $('#d1').offset().left; //元素移动前位置x  absolute

                // originPositionY = $('#d1').offset().top;  //元素移动前位置y  absolute

                originWidth = $('#d1').width();

                originHeight = $('#d1').height();

            });

            $('body').on('mousemove',function(event){

                event = event || window.event;

                var mouseX = event.clientX;

                var mouseY = event.clientY;

                var elemLeft = $('#d1').offset().left;

                var elemTop =  $('#d1').offset().top;

                var elemWidth = $('#d1').width();

                var elemHeight = $('#d1').height();



                if((elemLeft <= mouseX && mouseX <= elemLeft+2)&&(elemTop <= mouseY && mouseY <= elemTop + elemHeight) ||

                    (elemLeft+elemWidth-2 <= mouseX && mouseX <= elemLeft+elemWidth+2)&&(elemTop <= mouseY && mouseY <= elemTop + elemHeight) ||

                    ((elemLeft <= mouseX && mouseX <= elemLeft+elemWidth)&&( elemTop <= mouseY && mouseY <= elemTop+2)) ||

                    ((elemLeft <= mouseX && mouseX <= elemLeft+elemWidth)&&( elemTop+elemHeight-10 <= mouseY && mouseY <= elemTop+elemHeight+2))

                ){

                    $('#d1').addClass('class-resize');

                }else{

                    $('#d1').removeClass('class-resize');

                };

                if(canResize){

                    var moveX = event.clientX - downPositonX;

                    var moveY = event.clientY - downPositonY;

                    $('#d1').width(originWidth + moveX);

                    $('#d1').height(originHeight + moveY);



                }



            });

            $('#d1').on('mouseup',function(event){

                canResize = false;

            })

        })

    </script>



</body>

</html>
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