//上传头像图片

        function uploadHead(imgPath) {

            console.log("imgPath = " + imgPath);

            var image = new Image();

            image.onload = function() {

                var imgData = getBase64Image(image);

                /*在这里调用上传接口*/

                mui.ajax($serverPath + "app/modifyHead", {

                    data: {

                        'imgData': imgData,

                        'userId': plus.storage.getItem("userId")

                    },

                    dataType: 'json',

                    type: 'post',

                    timeout: 10000,

                    success: function(data) {

                        if(data.result == 'yes') {

                            $newHead = data.newHeadPath;

                            console.log('上传成功！！！！！！！！！！' + $newHead);

                            plus.storage.setItem("userHead", $newHead);

                            mui.toast("头像修改成功！");

                        } else {

                            mui.toast("头像上传失败！");

                        }

                    },

                    error: function(xhr, type, errorThrown) {

                        mui.toast('网络异常，请稍后再试！');

                    }

                });

            }

            image.src = imgPath;

            image.style.width = "60px";

            image.style.height = "60px";

            console.log("haha");

        }

        //将图片压缩转成base64

        function getBase64Image(img) {

            var canvas = document.createElement("canvas");

            var width = img.width;

            var height = img.height;

            // calculate the width and height, constraining the proportions

            if(width > height) {

                if(width > 100) {

                    height = Math.round(height *= 100 / width);

                    width = 100;

                }

            } else {

                if(height > 100) {

                    width = Math.round(width *= 100 / height);

                    height = 100;

                }

            }

            canvas.width = width; /*设置新的图片的宽度*/

            canvas.height = height; /*设置新的图片的长度*/

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

            ctx.drawImage(img, 0, 0, width, height); /*绘图*/

            var dataURL = canvas.toDataURL("image/png", 0.8);

            return dataURL.replace("data:image/png;base64,", "");

        }