thinkphp3.2+cropper实现多张图片的上传并剪切图片（代码示例）

首先我们来看看实现的效果截图：

点加号可以继续上传第二张图片

代码部分：

前端代码：

<--引入cropper相关文件-->
<link rel="stylesheet" href="/home/style/cropper.css" />
    <link href="/home/tupian/css/bootstrap.min.css" rel="stylesheet">
    <link href="/home/tupian/css/cropper.min.css" rel="stylesheet">
    <link href="/home/tupian/css/main.css" rel="stylesheet">

    <script src="/home/tupian/js/jquery.min.js"></script>
    <script src="/home/tupian/js/bootstrap.min.js"></script>
    <script src="/home/tupian/js/cropper.min.js"></script>
    <script src="/home/tupian/js/main.js"></script>
    <script src="http://www.jq22.com/jquery/jquery-2.1.1.js"></script>
    <div class="form-group">
            <label class="col-sm-3 control-label">照片：</label>
            <div class="col-sm-9">
                    <div class="a-up"> <--是第二张图片加号的效果-->
                            <input type="file" onchange="onChangeFn(this); "name="image[]" accept="image/jpeg,image/png"  required />
                     </div>
               <div class="error">*请添加图片</div>
            </div>
     </div>
    <--模态框-->
     <div class="modal fade" id="modal" tabindex="-1" role="dialog" aria-labelledby="modalLabel" aria-hidden="true">
    <div class="modal-dialog" role="document">
        <div class="modal-content">
            <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
            <div class="modal-header">
                <h5 class="modal-title" id="modalLabel">剪裁图片</h5>
            </div>
            <div class="modal-body">
                <div class="img-container">
                    <img id="image" style="max-width:100%;max-height:350px;"><--这里的最大高度一定要设置-->
                </div>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-primary" id="crop">Crop</button>
            </div>
        </div>
    </div>
</div>   

    function onChangeFn (obj) {
        var _this=$(obj),
            _upload=_this.parent();
        currentUpload=_upload;
        // <img src="images/erweima.png" class="upload-img">
        //截取开始
        var files = obj.files;
        var done = function (url) {
            image.src = url;
            $modal.modal('show');
        };
        var reader;
        var file;
        var url;
        if (files && files.length > 0) {
            file = files[0];
            if (URL) {
                done(URL.createObjectURL(file));
            } else if (FileReader) {
                reader = new FileReader();
                reader.onload = function (e) {
                    done(reader.result);
                };
                reader.readAsDataURL(file);
            }
        }
    }
    var image = document.getElementById('image');
    var $modal = $('#modal');
    var currentUpload;
    var cropper;
    $modal.on('shown.bs.modal', function () {
        cropper = new Cropper(image, {
            aspectRatio: 16/9,
            zoomable:true,
            zoomOnWheel:true,
            viewMode: 0,
        });
    }).on('hidden.bs.modal', function () {
        cropper.destroy();
        cropper = null;
    });

    document.getElementById('crop').addEventListener('click', function () {
        var canvas;
        $modal.modal('hide');
        if (cropper) {
            canvas = cropper.getCroppedCanvas({
                width: 800,
                height: 500,
            });
//            avatar.src = canvas.toDataURL();
　　　　　　  <--读取图片-->

            var reader = new FileReader();
            reader.onload = function(evt) {
                currentUpload.before('<div class="divimg"><img src="' + evt.target.result + '" class="upload-img"><input type="hidden" value="' + evt.target.result + '" name="picc[]"><button type="button" class="close" onclick="closeFun(this,1);"></button></div>');
            }
            canvas.toBlob(function (result) {reader.readAsDataURL(result);},"image/jpeg");
//            console.log(canvas);
            if (currentUpload.next().css('display')=='block') {
                currentUpload.next().css('display','none')
            }
            var strHtml='<div class="a-up"><input type="file" onchange="onChangeFn(this);" name="image[]" accept="image/jpeg,image/png" id="pic" /></div>';
            currentUpload.after(strHtml);
            currentUpload.hide();
        }
    });

后台部分:

<--接收过来的是base64的图片,速度较慢,应该是转成blob图片再传给后台,还没做>
            $base64_image_content = $_POST["picc"];
            foreach($base64_image_content as $k=>$v){
                $imageName = date("His",time())."_".rand(1111,9999).'.png';
                $dir = date('Ymd');
                $path = 'uploads/'.$dir;
                if (!is_dir($path)){ //判断目录是否存在 不存在就创建
                    mkdir($path,0777,true);
                }
                if (strstr($v,",")){
                    $base64_image_contents = explode(',',$v);
                    $base64_image = $base64_image_contents[1];
                    $root = $_SERVER['DOCUMENT_ROOT']."/".$path."/". $imageName;
                    $r = file_put_contents($root, base64_decode($base64_image));//返回的是字节数
                }
                $image[] = '/'.$path.'/'. $imageName;
            }

            foreach ($image as $kk=>$vv) {
                $images[] = json_encode($vv, true);
            }
            $data["image"] = '['.implode(',',$images).']';

//将base64格式图片转换为文件形式
   function dataURLtoBlob(dataurl) {  
        var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);        
        while(n--){
                u8arr[n] = bstr.charCodeAt(n);
        }        
             return new Blob([u8arr], {type:mime});
    }

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