wx.chooseImage({
    count: 1,
    sizeType: [‘compressed’],
    success: function(info){
        var paths = info.tempFilePaths;
        wx.uploadFile({
            url: url,    //服务器上传地址
            filePath: paths[0],
            name: ‘file’,    //上传文件对应表单字段
            header: {   //请求头
                ‘content-type’: ‘application/x-www-form-urlencoded’
            },
            formData: {type: ‘jpg’},   //其他额外的表单字段
            success: function(res, code){
                
            }
        });
    }
});