$("#up_goods_pic").on('change',function(){

        var file = this.files[0];

        var url = webkitURL.createObjectURL(file);

        /* 生成图片

        * ---------------------- */

        var $img = new Image();

        $img.onload = function() {

            //生成比例

            var width = $img.width,

                    height = $img.height,

                    scale = width / height;

            width = parseInt(800);

            height = parseInt(width / scale);

            //生成canvas

            var canvas = document.createElement('CANVAS');

            var ctx = canvas.getContext('2d');

            canvas.height = this.height;

            canvas.width = this.width;

            ctx.drawImage($img, 0, 0, width, height);

            var base64 = canvas.toDataURL('image/jpeg');

            //发送到服务端

            $.ajax({

                data:{

                    data:base64

                },

                url:"/shop/upload_goods_pic",

                type:"POST",

                dataType:"json",

                succeed:function(data){

                    if(data.error === 0){

                        $("#goods_pic").append("<img src='"+data.file+"'/>");

                    }else{

                        alert(data.msg);

                    }

                }

            });

        }

        $img.src = url;

    });

        $base64_image_content = $this->input->post("data");

        if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)){

            $type = $result[2];

            $new_file = "./".time().rand().".{$type}";

            if (file_put_contents($new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))){

                $this->goods_pic_model->add($new_file);

                die(json_encode(array("file"=>$new_file,"error"=>0)));

            }

        }

        die(json_encode(array("error"=>1)));