微信小程序~评论加图片上传、预览、删除

先看看效果图，是不是自己需要的

wxml:

<view class="conts">
    <textarea class="areas" placeholder='留下点评，帮助更多人' minlength="{{min}}" maxlength="{{max}}" bindinput="inputs">textarea>
    <text class="hint">{{texts}}text>
    <text class="currentWordNumber">{{currentWordNumber|0}}/{{max}}text>
view>

<view class="img_box">
  <view class="imgs" wx:for="{{tempFilePaths}}" wx:key="index">
    <image src='{{item}}' bindlongpress="deleteImage" bindtap="listenerButtonPreviewImage" data-index="{{index}}" mode='widthFix' />
  view>
  <view class="imgs">
    <view class="images" bindtap="upload">
      <image src='../../image/tianjia.png' mode='widthFix' />
    view>
  view>
view>

wxss:

/* 评论 */
.conts{
  width:90%;
  height: auto;
  position:relative;
  padding-bottom:50rpx;
  margin:0 auto;
}
.areas{
  width:100%;
  height:152rpx;
  font-size: 30rpx;
  text-indent: 28rpx;
  border: 1rpx solid gainsboro;
  padding-top: 30rpx;
  margin: 0 auto;
  overflow: hidden;   
  position: relative; 
}
.currentWordNumber{
  font-size: 28rpx;
  color: gray;
  position: absolute;
  right:10rpx;
  bottom:10rpx;
}
.hint{
   font-size: 28rpx;
   position: absolute;
   left:20rpx;
   bottom:10rpx;
   color: #FF6600;
}
/* 图片 */
.img_box{
  width:690rpx;
  position:relative;
  display: flex;
  flex-wrap: wrap;
  margin:0 auto;
}
.imgs{
  width:33.33333333%;
  display: flex;
  justify-content: center;
  margin-bottom:20rpx;
}
.imgs image{
  width:90%;
  max-height:212rpx;
  border:1px solid rgba(214, 212, 212, 0.1);
  /* box-shadow: 5rpx 5rpx 1rpx 3rpx #e2e0e0; */
}
.imgs .images{
  position:relative;
}
.images button{
  width:100%;
  height:100%;
  position:absolute;
  top:0;
  left:0;
}
.img_box .images{
  width:90%;
	height: 212rpx;
  border:1px solid #E8E8E8;
  border-radius:4rpx;
  display: flex;
  align-items: center;
  justify-content: center;
}
.img_box .images>image{
  width:60rpx;
	height:60rpx;
}

js:

Page({
  /**
   * 页面的初始数据
   */
  data: {
    texts: "",
    min: 5,//最少字数
    max: 22, //最多字数 (根据自己需求改变)
    tempFilePaths: []
  },
  /**
   * 字数限制
   */ 
  inputs: function (e) {
    // 获取输入框的内容
    var value = e.detail.value;
    // 获取输入框内容的长度
    var len = parseInt(value.length);
    //最少字数限制
    if (len <this.data.min){
      this.setData({
        texts: "加油，至少要输入5个字哦"
      })
    }else if (len >= this.data.min){
      this.setData({
        texts: " "
      })
    }
    //最多字数限制
    if (len > this.data.max) return;
    // 当输入框内容的长度大于最大长度限制（max)时，终止setData()的执行
    this.setData({
      currentWordNumber: len //当前字数  
    });
  },
  /**
   * 上传图片方法
   */
  upload: function () {
    let that = this;
    wx.chooseImage({
      count: 9, // 默认9
      sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
      sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
      success: res => {
        wx.showToast({
          title: '正在上传...',
          icon: 'loading',
          mask: true,
          duration: 1000
        })
        // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
        let tempFilePaths = res.tempFilePaths;

        that.setData({
          tempFilePaths: tempFilePaths
        })
        /**
         * 上传完成后把文件上传到服务器
         */
        var count = 0;
        for (var i = 0, h = tempFilePaths.length; i < h; i++) {
          //上传文件
          /*  wx.uploadFile({
              url: HOST + '地址路径',
              filePath: tempFilePaths[i],
              name: 'uploadfile_ant',
              header: {
                "Content-Type": "multipart/form-data"
              },
              success: function (res) {
                count++;
                //如果是最后一张,则隐藏等待中  
                if (count == tempFilePaths.length) {
                  wx.hideToast();
                }
              },
              fail: function (res) {
                wx.hideToast();
                wx.showModal({
                  title: '错误提示',
                  content: '上传图片失败',
                  showCancel: false,
                  success: function (res) { }
                })
              }
            });*/
        }

      }
    })
  },
  /**
   * 预览图片方法
   */
  listenerButtonPreviewImage: function (e) {
    let index = e.target.dataset.index;
    let that = this;
    console.log(that.data.tempFilePaths[index]);
    console.log(that.data.tempFilePaths);
    wx.previewImage({
      current: that.data.tempFilePaths[index],
      urls: that.data.tempFilePaths,
      //这根本就不走
      success: function (res) {
        //console.log(res);
      },
      //也根本不走
      fail: function () {
        //console.log('fail')
      }
    })
  },
  /**
   * 长按删除图片
   */
  deleteImage: function (e) {
    var that = this;
    var tempFilePaths = that.data.tempFilePaths;
    var index = e.currentTarget.dataset.index;//获取当前长按图片下标
    wx.showModal({
      title: '提示',
      content: '确定要删除此图片吗？',
      success: function (res) {
        if (res.confirm) {
          console.log('点击确定了');
          tempFilePaths.splice(index, 1);
        } else if (res.cancel) {
          console.log('点击取消了');
          return false;
        }
        that.setData({
          tempFilePaths
        });
      }
    })
  }
})