JavaScript拖拽

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>JS拖拽</title>
    <style>
        *{padding: 0; margin: 0; }
        .box{width: 100px;height: 100px;background: blue;position: absolute; }
    </style>
    <script src="jquery.min.js"></script>
    <script>
        var isDown = false;
        var ObjLeft, ObjTop, posX, posY, obj,offsetX,offsetY;
        $(function(){
            obj=$("#box");
            obj.onmousedown = down;
            document.onmousemove = move;
            document.onmouseup = up;
        })
        function down(event){
            isDown=true;
            obj.style.cursor = "move";
            ObjLeft = obj.offset().left;
            ObjTop = obj.offset().top;
        }
    </script>
    <script>
        var isDown = false;
        var ObjLeft, ObjTop, posX, posY, obj,offsetX,offsetY;
        window.onload = function() {
            obj = document.getElementById('box');
            obj.onmousedown = down;
            document.onmousemove = move;
            document.onmouseup = up;
        }
        function down(event) {
            obj.style.cursor = "move";
            isDown = true;
            ObjLeft = obj.offsetLeft;
            ObjTop = obj.offsetTop;
            posX = parseInt(mousePosition(event).x);
            posY = parseInt(mousePosition(event).y);
            offsetX=posX-ObjLeft;
            offsetY=posY-ObjTop;
        }
        function move(event) {
            if (isDown == true) {
                var x=mousePosition(event).x-offsetX;
                var y=mousePosition(event).y-offsetY;
                var w = document.documentElement.clientWidth - obj.offsetWidth;
                var h = document.documentElement.clientHeight - obj.offsetHeight;
                console.log(x + ',' + y);
                x=Math.min(w,Math.max(0,x));
                y=Math.min(h,Math.max(0,y));
                obj.style.left = x + 'px';
                obj.style.top = y + 'px';
            }
        }

        function up() {
            isDown = false;
        }

        function mousePosition(evt) {
            var xPos, yPos;
            evt = evt || window.event;
            if (evt.pageX) {
                xPos = evt.pageX;
                yPos = evt.pageY;
            } else {
                xPos = evt.clientX + document.body.scrollLeft - document.body.clientLeft;
                yPos = evt.clientY + document.body.scrollTop - document.body.clientTop;
            }
            return {
                x: xPos,
                y: yPos
            }
        }
    </script>
</head>
<body>
<div id="box" class="box"></div>
</body>
</html>
巴特西

JavaScript拖拽

最新文章

热门文章
