微信小程序本地上传图片，在小程序开发文档上面有说明：

wx.chooseImage(Object object) | 微信开放文档

wx.previewImage(Object object) | 微信开放文档

 

 wxml: 图片用wx:for循环，后面用带有加号的图片。

<view class="content">
    <text>微信小程序练习demo</text>
    <view class="upload">
        <view class="imgArr" wx:if="{{upImage.length > 0}}" wx:for="{{upImage}}" wx:key="index">
            <image src="{{item}}" class="upImage" mode="widthFix" bindtap="previewImage" data-src="{{item}}"></image>
            <image class="delete" bindtap="delete" src="../../images/cha.png" data-id="{{index}}"></image>
        </view>
        <image wx:if="{{upImage.length < 9}}" src="../../images/shangc.png" class="upImage" bindtap="uploadImg"></image>
    </view>
</view>

wxss:

.content{
    width: 100%;
    padding: 0 20rpx;
}
.upload{
    margin-top: 20rpx;
    width: 100%;
    height: 200rpx;
    display: flex;
    flex-wrap: wrap;
}
.imgArr{
    display: flex;
    position: relative;
}
.imgArr:nth-child(3n+2){
    margin-bottom: 15rpx;
}
.imgArr .upImage{
    margin-right:15rpx;
}
.upImage{
    width: 200rpx;
    height: 200rpx;
}
/* .upImage:nth-child(2){
    margin-left: 15rpx;
} */
.delete{
    width: 40rpx;
    height: 40rpx;
    position: absolute;
    top: -5rpx;
    right: -5rpx;
}

js:

data: {
        upImage:[]
    },

//图片上传
    uploadImg(){
        let that = this;
        wx.chooseImage({
          count: 9,
          sizeType: ['original', 'compressed'],
          sourceType: ['album', 'camera'],
          success(res){
              console.log(res);
              const tempFilePaths  = res.tempFilePaths[0];
              let old_data = that.data.upImage;
              let new_data = res.tempFilePaths;
              if(that.data.upImage.length + res.tempFilePaths.length <=9){
                  that.setData({
                    upImage : old_data.concat(new_data)
                  })
                  console.log(that.data.upImage)
              }else{
                  wx.showToast({
                    title: '上传图片不能超过9张',
                    icon:"none"
                  })
              }
          }
        })
    },
    //图片预览
    previewImage(e){
        let that = this;
        let current = e.currentTarget.dataset.src;
        console.log(current);
        let urls = that.data.upImage;
        console.log(urls);
        // urls.push(current);
        wx.previewImage({
            current: current, // 当前显示图片的http链接
            urls: urls // 需要预览的图片http链接列表
        })
    },
    //图片删除
    delete(e){
        console.log(e);
        let that = this;
        let upImage = that.data.upImage;
        let index = e.currentTarget.dataset.id;
        console.log(index);
        wx.showModal({
          title:"提示",
          content:"确定要删除此图片吗？",
          success:function (res) {
              if(res.confirm){
                  console.log("点击了确定");
                  upImage.splice(index,1);
                  that.setData({
                    upImage
                  })
              }else if(res.cancel){
                console.log("点击了取消");
              }
          }
        })
    },

 最后的效果大概是：