微信小程序上传多张图片限制大小的实例详细解析

data:{

    img:[], //设置一个数组

}

add_img:function(){

    var that = this,

    img = that.data.img;

        if(img.length < 3){  //如果图片数量小于3张，可以直接获取图片

            wx.chooseImage({

                count:1,     //默认9

                sizeType:['compressed'], //可以指定原图还是压缩图，默认二者都有

                sourceType:['album','camera'],//可以指定来源相册还是相机，默认二者都有

                success:function(res){

                    var tempFilesSize = res.tempFiles[0].size;  //获取图片的大小，单位B

                    if(tempFilesSize <= 2000000){   //图片小于或者等于2M时 可以执行获取图片

                        var tempFilePaths = res.tempFilePaths[0]; //获取图片

                        that.data.img.push(tempFilePaths);   //添加到数组

                        that.setData({

                            img:that.data.img

                        })

                    }else{    //图片大于2M，弹出一个提示框

                        wx.showToast({

                            title:'上传图片不能大于2M!',  //标题

                            icon:'none'       //图标 none不使用图标，详情看官方文档

                        })

                    }

                }

            })

        }else{  //大于三张时直接弹出一个提示框

             wx.showToast({

                 title:'上传图片不能大于3张!',

                 icon:'none'  

             })

        }

}