Question

我正在制作一个网页，在调整了一些代码之后，我在网站上的图像不再显示但是我在控制台中有错误这里是代码请有人帮助我尝试了一些事情没有运气所以这是我的最后一个景区

<!DOCTYPE HTML>
<html>        
    <head>
        <link rel="StyleSheet" type="text/css" href="StyleSheet.css">
        <style>
            body {
                margin: 0px;
                padding: 0px;
            }
        </style>
        <script src="kinetic-v5.1.0.min.js" type="text/javascript"></script>
        <script src="jquery.min.js" type="text/javascript"></script>
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
        <link href="css/bootstrap.min.css" rel="stylesheet" />
        <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
        <script src="jquery.mousewheel.min.js" type="text/javascript"></script>
        <link href="easy-sidebar.css" rel="stylesheet" type="text/css">
    </head>

    <body>
        <nav class="navbar navbar-inverse easy-sidebar" style="z-index: 99999; position: absolute;">
            <div class="container-fluid">
                <!-- Brand and toggle get grouped for better mobile display -->
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle easy-sidebar-toggle" aria-expanded="false"> <span class="sr-only">Toggle navigation</span>  <span class="icon-bar"></span>  <span class="icon-bar"></span>  <span class="icon-bar"></span> 
                    </button> <a class="navbar-brand" href="#">Brand</a>

                </div>
                <ul class="nav navbar-nav">
                    <aside>
                        <ul class="nav nav-tabs">
                            <li><a href="#one" aria-controls="one" role="tab" data-toggle="tab">One</a>

                            </li>
                            <li><a href="#two" aria-controls="two" role="tab" data-toggle="tab">Two</a>

                            </li>
                        </ul>
                        <div class="tab-content">
                            <div role="tabpanel" class="tab-pane active" id="one"></div>
                            <div role="tabpanel" class="tab-pane" id="two"></div>
                        </div>
                    </aside>
                    <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a>

                    </li>
                    <li><a href="#">Link</a>

                    </li>
                    <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown
    <span class="caret"></span></a>

                        <ul class="dropdown-menu" role="menu">
                            <li><a href="#">Action</a>

                            </li>
                            <li><a href="#">Another action</a>

                            </li>
                            <li><a href="#">Something else here</a>

                            </li>
                            <li class="divider"></li>
                            <li><a href="#">Separated link</a>

                            </li>
                            <li class="divider"></li>
                            <li><a href="#">One more separated link</a>

                            </li>
                        </ul>
                    </li>
                </ul>
                <form class="navbar-form navbar-left" role="search">
                    <div class="form-group">
                        <input type="text" class="form-control" placeholder="Search">
                    </div>
                    <button type="submit" class="btn btn-default">Submit</button>
                </form>
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="#">Link</a>

                    </li>
                    <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown
    <span class="caret"></span></a>

                        <ul class="dropdown-menu" role="menu">
                            <li><a href="#">Action</a>

                            </li>
                            <li><a href="#">Another action</a>

                            </li>
                            <li><a href="#">Something else here</a>

                            </li>
                            <li class="divider"></li>
                            <li><a href="#">Separated link</a>

                            </li>
                        </ul>
                    </li>
                </ul>
            </div>
        </nav>
        <div class="bodyMain" style="z-index: 1 !important; display: inline-block; position: absolute; left: 0px;">
            <div class="container" style="">
                <button class="btn btn-danger easy-sidebar-toggle">Toggle Sidebar</button>
                <script type="text/javascript">

                </script>
            </div>
            <div id="canvasContainer" style="width: 800px; height: 940px; border: 1px solid; padding-left: 0; padding-right: 0;
    margin-left: auto; margin-right: auto; display: block; "></div>
            <script type="text/javascript">
                $(document).ready(function() {
                    $(document).mousewheel(function(event, delta) {
                        setYPos(delta);
                    });

                });


                var yposition = 50;
                var xposition = 20;
                var width = 200;
                var height = 137;

                function setYPos(v) {
                    yposition += v;
                    width += v;
                    height += v;
                    console.debug('Y: ', yposition);
                    drawImage(imageObj);
                }

                function drawImage(imageObj) {

                    var stage = new Kinetic.Stage({
                        container: "canvasContainer",
                        width: $('#canvasContainer').width(),
                        height: $('#canvasContainer').height()
                    });

                    var layer = new Kinetic.Layer();

                    // image

                    var image1 = new Kinetic.Image({
                        image: imageObj,
                        x: xposition,
                        y: yposition,
                        width: width,
                        height: height,
                        draggable: true,
                        dragBoundFunc: function(pos) {
                            if (pos.x < this.minX) this.minX = pos.x;
                            return {
                                x: pos.x,
                                y: this.getAbsolutePosition().y
                            }

                        }
                    });

                    stage.getContent().addEventListener('mousemove', function() {
                        xposition = stage.getPointerPosition().x;
                    });

                    // add cursor styling
                    image1.on('mouseover', function() {
                        document.body.style.cursor = 'pointer';
                    });
                    image1.on('mouseout', function() {
                        document.body.style.cursor = 'default';
                    });

                    image1.dragBoundFunc(function() {
                        return {
                            x: xposition,
                            y: yposition
                        };
                    });

                    layer.add(image1);
                    stage.add(layer);



                    var imageObj = new Image();
                    imageObj.onload = function() {
                        drawImage(this);
                    };

                    imageObj.src = 'image1.png';

                };
            </script>
        </div>
        <script src="js/bootstrap.min.js"></script>
        <script>
            $("#menu-toggle").click(function(e) {
                e.preventDefault();
                $("#wrapper").toggleClass("toggled");
            });
        </script>
    </body>

</html>

Answer 1

看起来错误是因为您在使用imageObj变量后定义它。相反，重新排列代码以将imageObj定义放在其他顶级变量定义附近。

换句话说，将大脚本块更改为以下内容：

<script type="text/javascript">
    $(document).ready(function() {
        $(document).mousewheel(function(event, delta) {
            setYPos(delta);
        });

    });


    var yposition = 50;
    var xposition = 20;
    var width = 200;
    var height = 137;

    var imageObj = new Image();
    imageObj.onload = function() {
        drawImage(this);
    };

    imageObj.src = 'image1.png';

    function setYPos(v) {
        yposition += v;
        width += v;
        height += v;
        console.debug('Y: ', yposition);
        drawImage(imageObj);
    }

    function drawImage(imageObj) {

        var stage = new Kinetic.Stage({
            container: "canvasContainer",
            width: $('#canvasContainer').width(),
            height: $('#canvasContainer').height()
        });

        var layer = new Kinetic.Layer();

        // image

        var image1 = new Kinetic.Image({
            image: imageObj,
            x: xposition,
            y: yposition,
            width: width,
            height: height,
            draggable: true,
            dragBoundFunc: function(pos) {
                if (pos.x < this.minX) this.minX = pos.x;
                return {
                    x: pos.x,
                    y: this.getAbsolutePosition().y
                }

            }
        });

        stage.getContent().addEventListener('mousemove', function() {
            xposition = stage.getPointerPosition().x;
        });

        // add cursor styling
        image1.on('mouseover', function() {
            document.body.style.cursor = 'pointer';
        });
        image1.on('mouseout', function() {
            document.body.style.cursor = 'default';
        });

        image1.dragBoundFunc(function() {
            return {
                x: xposition,
                y: yposition
            };
        });

        layer.add(image1);
        stage.add(layer);
    };
</script>

图片未在网页上显示

1 个答案: