剪裁正方形图片cropper

<!DOCTYPE html>

<html lang="zh-cn">

<head>

<meta charset="UTF-8">

<title>裁剪图片</title>

<link href="https://cdn.bootcss.com/cropper/3.1.3/cropper.min.css" rel="stylesheet">

<!--<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">-->

<style>

        .cropper-view-box{

          border-radius: 50%;

        }

        #photo {

            max-width: 100%;

        }

        .img-preview {

            width: 100px;

            height: 100px;

            overflow: hidden;border-radius: 50%;

        }

        button {

            margin-top:10px;

        }

        #result {

            width: 150px;

            height: 150px;

        }

</style>

</head>

<body>

<div class="container">

    <div class="row">

        <div class="col-sm-12 text-center">

            <label for="input" class="btn btn-danger" id="">

            <span>选择图片</span>

            <input type="file" id="input" class="sr-only">

            </label>

        </div>

    </div>

    <div class="">

        <div class="" style="width:50%">

            <img src="" id="photo" >

        </div>

        <div class="">

            <div>

                <p>

                    预览(100*100)：

                </p>

                <div class="img-preview">

                </div>

            </div>

            <button class="" onclick="crop()">裁剪图片</button>

            <div>

                <br/>

                <p>

                    结果：

                </p>

                <img src="" alt="裁剪结果" id="result">

            </div>

        </div>

    </div>

</div>

<!-- Scripts -->

<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>

<script src="https://cdn.bootcss.com/cropper/3.1.3/cropper.min.js"></script>

<!--<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>-->

<script>

        // 修改自官方demo的js

        var initCropper = function (img, input){

            var $image = img;

            var options = {

                aspectRatio: 1, // 纵横比

                viewMode: 2,

                preview: '.img-preview' // 预览图的class名

            };

            $image.cropper(options);

            var $inputImage = input;

            var uploadedImageURL;

            if (URL) {

                // 给input添加监听

                $inputImage.change(function () {

                    var files = this.files;

                    var file;

                    if (!$image.data('cropper')) {

                        return;

                    }

                    if (files && files.length) {

                        file = files[0];

                        // 判断是否是图像文件

                        if (/^image\/\w+$/.test(file.type)) {

                            // 如果URL已存在就先释放

                            if (uploadedImageURL) {

                                URL.revokeObjectURL(uploadedImageURL);

                            }

                            uploadedImageURL = URL.createObjectURL(file);

                            // 销毁cropper后更改src属性再重新创建cropper

                            $image.cropper('destroy').attr('src', uploadedImageURL).cropper(options);

                            $inputImage.val('');

                        } else {

                          window.alert('请选择一个图像文件！');

                      }

                  }

              });

            } else {

                $inputImage.prop('disabled', true).addClass('disabled');

            }

        }

        var crop = function(){

            var $image = $('#photo');

            var $target = $('#result');

            $image.cropper('getCroppedCanvas',{

                width:300, // 裁剪后的长宽

                height:300

            }).toBlob(function(blob){

                // 裁剪后将图片放到指定标签

                $target.attr('src', URL.createObjectURL(blob));

            });

        }

        $(function(){

            initCropper($('#photo'),$('#input'));

        });

    </script>

</body>

</html>
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剪裁正方形图片cropper

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