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  • 【小程序开发原创】小程序裁剪图片上传头像,二维码源码

    微信小程序 图片裁剪工具,简单易用

    项目需求

    在做微信小程序的时候有个图片上传之前裁剪的需求,找过一些github中的项目,都不太理想,主要是没有办法自定义宽高,于是自己研究了一下,做了一个简单的图片裁剪效果

    使用方法

    项目里面直接放的该功能的文件,将这个文件夹复制到小程序项目中,在app.json中启动该页面即可看到效果

    微信小程序技术比较新,所以在网上找了很久都没有找到理想的裁剪插件,正好这两天不是很忙就自己查找资料做了,经过一天的努力终于把它做出来了,不容易啊,现在把它分享给你们(可为你门节省一天开发时间哦):

    wxml:

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    <!--图片展示 -->
     <view bindtap='upEwm' data-which='1' >
      <view>第一个图</view>
       <image style='200rpx;height:200rpx;</image>
    </view>
    <view bindtap='upEwm'  data-which='2' >
      <view>第二个图</view>
       <image style='200rpx;height:200rpx;</image>
    </view>
     
     
    <!--裁剪图片浮层-->
    <view class='fixed-upimg'  wx:if="{{imageFixed}}">
    <view class="wx-content-info" >
    <!-- <view class="wx-content-info" wx:if="{{imageSrc}}"> -->
      <view wx:if="{{isShowImg}}" class="wx-corpper" style="{{cropperInitW}}rpx;height:{{cropperInitH}}rpx;background:#000">
        <view bindtap='upLoad'  class="wx-corpper-content" style="{{cropperW}}rpx;height:{{cropperH}}rpx;left:{{cropperL}}rpx;top:{{cropperT}}rpx">
          <image src="{{imageSrc}}" style="{{cropperW}}rpx;height:{{cropperH}}rpx"></image>
          <view class="wx-corpper-crop-box" bindtouchstart="contentStartMove" bindtouchmove="contentMoveing" style="{{cutW}}rpx;height:{{cutH}}rpx;left:{{cutL}}rpx;top:{{cutT}}rpx">
            <view class="wx-cropper-view-box">
              <!-- <view class="wx-cropper-viewer">
                <image src="{{imageSrc}}" style="{{cropperW}}rpx;height:{{cropperH}}rpx;left:{{cropperL - cutL}}rpx;top:{{cropperT - cutT}}rpx"></image>
              </view> -->
              <view class="wx-cropper-dashed-h"></view>
              <view class="wx-cropper-dashed-v"></view>
              <view class="wx-cropper-line-t" data-drag="top" catchtouchstart="dragStart" catchtouchmove="dragMove"></view>
              <view class="wx-cropper-line-r" data-drag="right" catchtouchstart="dragStart" catchtouchmove="dragMove"></view>
              <view class="wx-cropper-line-b" data-drag="bottom" catchtouchstart="dragStart" catchtouchmove="dragMove"></view>
              <view class="wx-cropper-line-l" data-drag="left" catchtouchstart="dragStart" catchtouchmove="dragMove"></view>
              <view class="wx-cropper-point point-t" data-drag="top" catchtouchstart="dragStart" catchtouchmove="dragMove"></view>
              <view class="wx-cropper-point point-tr" data-drag="topTight"></view>
              <view class="wx-cropper-point point-r" data-drag="right" catchtouchstart="dragStart" catchtouchmove="dragMove"></view>
              <view class="wx-cropper-point point-rb" data-drag="rightBottom" catchtouchstart="dragStart" catchtouchmove="dragMove"></view>
              <view class="wx-cropper-point point-b" data-drag="bottom" catchtouchstart="dragStart" catchtouchmove="dragMove"></view>
              <view class="wx-cropper-point point-bl" data-drag="bottomLeft"></view>
              <view class="wx-cropper-point point-l" data-drag="left" catchtouchstart="dragStart" catchtouchmove="dragMove"></view>
              <view class="wx-cropper-point point-lt" data-drag="leftTop"></view>
            </view>
          </view>
        </view>
        <!-- <view class="wx-cropper-drag-box"></view> -->
      </view>
      <canvas canvas-id="myCanvas" style="position:absolute;border: 1px solid red; {{imageW}}rpx;height:{{imageH}}rpx;top:-9999px;left:-9999px;"></canvas>
      <button type="primary" bindtap="getImageInfo" style="position:fixed;bottom:120rpx;90%;left:50%;transform:translate3d(-50%,0,0)"> 确认提交 </button>
     
    </view>
    </view>

      js:

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    // pages/wx-cropper/index.js
    // 手机的宽度
    var windowWRPX = 750
    // 拖动时候的 pageX
    var pageX = 0
    // 拖动时候的 pageY
    var pageY = 0
     
    var pixelRatio = wx.getSystemInfoSync().pixelRatio
     
    // 调整大小时候的 pageX
    var sizeConfPageX = 0
    // 调整大小时候的 pageY
    var sizeConfPageY = 0
     
    var initDragCutW = 0
    var initDragCutL = 0
    var initDragCutH = 0
    var initDragCutT = 0
     
    // 移动时 手势位移与 实际元素位移的比
    var dragScaleP = 2
     
    Page({
      /**
       * 页面的初始数据
       */
      data: {
        imageNum:''//上传的图片id
        headImg:''//头像上传
        ewmImg:''//二维码上传
        imageFixed:false//裁剪浮层
        // imageSrc: 'http://topmdrt-static.oss-cn-shenzhen.aliyuncs.com/images/testimg2.jpeg',
        imageSrc: ''//要裁剪的图片
        returnImage: '',
        isShowImg: false,
        // 初始化的宽高
        cropperInitW: windowWRPX,
        cropperInitH: windowWRPX,
        // 动态的宽高
        cropperW: windowWRPX,
        cropperH: windowWRPX,
        // 动态的left top值
        cropperL: 0,
        cropperT: 0,
     
        // 图片缩放值
        scaleP: 0,
        imageW: 0,
        imageH: 0,
     
        // 裁剪框 宽高
        cutW: 400,
        cutH: 400,
        cutL: 0,
        cutT: 0,
      },
     
      /**
       * 生命周期函数--监听页面加载
       */
      onReady: function (options) {
      },
     
      /**
       * 生命周期函数--监听页面初次渲染完成
       */
      onLoad: function () {
        var _this = this
         
        // wx.showLoading({
        //   title: '图片加载中...',
        // })
     
        wx.getImageInfo({
          src: _this.data.imageSrc,
          success: function success(res) {
            var innerAspectRadio = res.width / res.height;
            console.log(innerAspectRadio)
            // 根据图片的宽高显示不同的效果   保证图片可以正常显示
            if (innerAspectRadio >= 1) {
              _this.setData({
                cropperW: windowWRPX,
                cropperH: windowWRPX / innerAspectRadio,
                // 初始化left right
                cropperL: Math.ceil((windowWRPX - windowWRPX) / 2),
                cropperT: Math.ceil((windowWRPX - windowWRPX / innerAspectRadio) / 2),
                // 裁剪框  宽高 
                // cutW: windowWRPX - 200,
                // cutH: windowWRPX / innerAspectRadio - 200,
                cutL: Math.ceil((windowWRPX - windowWRPX + 340) / 2),
                cutT: Math.ceil((windowWRPX / innerAspectRadio - (windowWRPX / innerAspectRadio - 20)) / 2),
                // 图片缩放值
                scaleP: res.width * pixelRatio / windowWRPX,
                // 图片原始宽度 rpx
                imageW: res.width * pixelRatio,
                imageH: res.height * pixelRatio
              })
            else {
              _this.setData({
                cropperW: windowWRPX * innerAspectRadio,
                cropperH: windowWRPX,
                // 初始化left right
                cropperL: Math.ceil((windowWRPX - windowWRPX * innerAspectRadio) / 2),
                cropperT: Math.ceil((windowWRPX - windowWRPX) / 2),
                // 裁剪框的宽高
                // cutW: windowWRPX * innerAspectRadio - 66,
                // cutH: 400,
                cutL: Math.ceil((windowWRPX * innerAspectRadio - (windowWRPX * innerAspectRadio - 20)) / 2),
                cutT: Math.ceil((windowWRPX - 340) / 2),
                // 图片缩放值
                scaleP: res.width * pixelRatio / windowWRPX,
                // 图片原始宽度 rpx
                imageW: res.width * pixelRatio,
                imageH: res.height * pixelRatio
              })
            }
            _this.setData({
              isShowImg: true
            })
            wx.hideLoading()
          }
        })
      },
     
      // 拖动时候触发的touchStart事件
      contentStartMove (e) {
        pageX = e.touches[0].pageX
        pageY = e.touches[0].pageY
      },
     
      // 拖动时候触发的touchMove事件
      contentMoveing (e) {
        var _this = this
        // _this.data.cutL + (e.touches[0].pageX - pageX)
        // console.log(e.touches[0].pageX)
        // console.log(e.touches[0].pageX - pageX)
        var dragLengthX = (pageX - e.touches[0].pageX) * dragScaleP
        var dragLengthY = (pageY - e.touches[0].pageY) * dragScaleP
        var minX = Math.max(_this.data.cutL - (dragLengthX), 0)
        var minY = Math.max(_this.data.cutT - (dragLengthY), 0)
        var maxX = _this.data.cropperW - _this.data.cutW
        var maxY = _this.data.cropperH - _this.data.cutH
        this.setData({
          cutL: Math.min(maxX, minX),
          cutT: Math.min(maxY, minY),
        })
        console.log(`${maxX} ----- ${minX}`)
        pageX = e.touches[0].pageX
        pageY = e.touches[0].pageY
      },
     
      // 获取图片
      getImageInfo () {
        var _this = this
        console.log('shengcheng:'+_this.data.imageSrc)
        wx.showLoading({
          title: '图片生成中...',
        })
        // wx.downloadFile({
        //   url:_this.data.imageSrc, //仅为示例,并非真实的资源     
        //   success: function (res) {
            // 将图片写入画布             
            const ctx = wx.createCanvasContext('myCanvas')
            // ctx.drawImage(res.tempFilePath)
            ctx.drawImage(_this.data.imageSrc)
             
            ctx.draw(true, () => {
              // 获取画布要裁剪的位置和宽度   均为百分比 * 画布中图片的宽度    保证了在微信小程序中裁剪的图片模糊  位置不对的问题
              var canvasW = (_this.data.cutW / _this.data.cropperW) * (_this.data.imageW / pixelRatio)
              var canvasH = (_this.data.cutH / _this.data.cropperH) * (_this.data.imageH / pixelRatio)
              var canvasL = (_this.data.cutL / _this.data.cropperW) * (_this.data.imageW / pixelRatio)
              var canvasT = (_this.data.cutT / _this.data.cropperH) * (_this.data.imageH / pixelRatio)
              console.log(`canvasW:${canvasW} --- canvasH: ${canvasH} --- canvasL: ${canvasL} --- canvasT: ${canvasT} -------- _this.data.imageW: ${_this.data.imageW}  ------- _this.data.imageH: ${_this.data.imageH} ---- pixelRatio ${pixelRatio}`)
              wx.canvasToTempFilePath({
                x: canvasL,
                y: canvasT,
                 canvasW,
                height: canvasH,
                destWidth: canvasW,
                destHeight: canvasH,
                canvasId: 'myCanvas',
                success: function (res) {
                  wx.hideLoading()
                  // 成功获得地址的地方
                  console.log('end:'+res.tempFilePath)
                  // 判断时上传头像还是二维码
                  _this.setData({
                    imageFixed: false,
                  })
                  if (_this.data.imageNum == '1') {
                    _this.setData({
                      headImg: res.tempFilePath
                    })
                  else if (_this.data.imageNum == '2') {
                    _this.setData({
                      ewmImg: res.tempFilePath
                    })
                  }
     
                }
              })
            })
        //   }
     
     
        // })
      },
     
      // 设置大小的时候触发的touchStart事件
      dragStart(e) {
        var _this = this
        sizeConfPageX = e.touches[0].pageX
        sizeConfPageY = e.touches[0].pageY
        initDragCutW = _this.data.cutW
        initDragCutL = _this.data.cutL
        initDragCutT = _this.data.cutT
        initDragCutH = _this.data.cutH
      },
      
      // 设置大小的时候触发的touchMove事件
      dragMove (e) {
        var _this = this
        var dragType = e.target.dataset.drag
        switch (dragType) {
          case 'right':
            var dragLength = (sizeConfPageX - e.touches[0].pageX) * dragScaleP
            if (initDragCutW >= dragLength) {
              // 如果 移动小于0 说明是在往下啦  放大裁剪的高度  这样一来 图片的高度  最大 等于 图片的top值加 当前图片的高度  否则就说明超出界限
              if (dragLength < 0 && _this.data.cropperW > initDragCutL + _this.data.cutW) {
                this.setData({
                  cutW: initDragCutW - dragLength
                })
              }
              // 如果是移动 大于0  说明在缩小  只需要缩小的距离小于原本裁剪的高度就ok
              if (dragLength > 0) {
                this.setData({
                  cutW: initDragCutW - dragLength
                })
              }
              else {
                return
              }
            else {
              return
            }
            break;
          case 'left':
            var dragLength = (dragLength = sizeConfPageX - e.touches[0].pageX) * dragScaleP
            console.log(dragLength)
            if (initDragCutW >= dragLength && initDragCutL > dragLength) {
              if (dragLength < 0 && Math.abs(dragLength) >= initDragCutW) return
              this.setData({
                cutL: initDragCutL - dragLength,
                cutW: initDragCutW + dragLength
              })
            else {
              return;
            }
            break;
          case 'top':
            var dragLength = (sizeConfPageY - e.touches[0].pageY) * dragScaleP
            if (initDragCutH >= dragLength && initDragCutT > dragLength) {
              if (dragLength < 0 && Math.abs(dragLength) >= initDragCutH) return
              this.setData({
                cutT: initDragCutT - dragLength,
                cutH: initDragCutH + dragLength
              })
            else {
              return;
            }
            break;
          case 'bottom':
            var dragLength = (sizeConfPageY - e.touches[0].pageY) * dragScaleP
            // console.log(_this.data.cropperH > _this.data.cutT + _this.data.cutH)
            console.log(dragLength)
            console.log(initDragCutH >= dragLength)
            console.log(_this.data.cropperH > initDragCutT + _this.data.cutH)
            // 必须是 dragLength 向上缩小的时候必须小于原本的高度
            if (initDragCutH >= dragLength) {
              // 如果 移动小于0 说明是在往下啦  放大裁剪的高度  这样一来 图片的高度  最大 等于 图片的top值加 当前图片的高度  否则就说明超出界限
              if (dragLength < 0 && _this.data.cropperH > initDragCutT + _this.data.cutH) {
                this.setData({
                  cutH: initDragCutH - dragLength
                })
              }
              // 如果是移动 大于0  说明在缩小  只需要缩小的距离小于原本裁剪的高度就ok
              if (dragLength > 0) {
                this.setData({
                  cutH: initDragCutH - dragLength
                })
              }
              else{
                return
              }
            else {
              return
            }
            break;
          case 'rightBottom':
            var dragLengthX = (sizeConfPageX - e.touches[0].pageX) * dragScaleP
            var dragLengthY = (sizeConfPageY - e.touches[0].pageY)  * dragScaleP
            if (initDragCutH >= dragLengthY && initDragCutW >= dragLengthX) {
              // bottom 方向的变化
              if ((dragLengthY < 0 && _this.data.cropperH > initDragCutT + _this.data.cutH) || (dragLengthY > 0)) {
                this.setData({
                  cutH: initDragCutH - dragLengthY
                })
              }
     
              // right 方向的变化
              if ((dragLengthX < 0 && _this.data.cropperW > initDragCutL + _this.data.cutW) || (dragLengthX > 0)) {
                this.setData({
                  cutW: initDragCutW - dragLengthX
                })
              }
              else {
                return
              }
            else {
              return
            }
            break;
          default:
            break;
        }
      },
      // 图片上传
      upLoad: function () {
      
      },
      upEwm: function(e){
        var _this = this
        wx.chooseImage({
          count: 1, // 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: function (res) {
            // 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
            var tempFilePaths = res.tempFilePaths;
            // var mode = parseFloat(e.currentTarget.dataset.current);
            console.log('shangchuan:' + tempFilePaths)
            console.log(e.currentTarget.dataset.which);
            _this.setData({
              imageFixed: true,
              imageSrc: tempFilePaths.join(),
              imageNum: e.currentTarget.dataset.which
            })
            // start
            wx.getImageInfo({
              src: _this.data.imageSrc,
              success: function success(res) {
                var innerAspectRadio = res.width / res.height;
                console.log('bili'+innerAspectRadio)
                // 根据图片的宽高显示不同的效果   保证图片可以正常显示
              
                 
                if (innerAspectRadio == '1') {
                  console.log('zhengfangxingtu')
                  _this.setData({
                    imageFixed: false,
                  })
                  // 判断时上传头像还是二维码
                  if (_this.data.imageNum == '1') {
                    _this.setData({
                      headImg: tempFilePaths.join()
                    })
                  else if (_this.data.imageNum == '2') {
                    _this.setData({
                      ewmImg: tempFilePaths.join()
                    })
                  }
                
                else if (innerAspectRadio > 1) {
                  _this.setData({
                    cropperW: windowWRPX,
                    cropperH: windowWRPX / innerAspectRadio,
                    // 初始化left right
                    cropperL: Math.ceil((windowWRPX - windowWRPX) / 2),
                    cropperT: Math.ceil((windowWRPX - windowWRPX / innerAspectRadio) / 2),
                    // 裁剪框  宽高 
                    // cutW: windowWRPX - 200,
                    // cutH: windowWRPX / innerAspectRadio - 200,
                    cutL: Math.ceil((windowWRPX - windowWRPX + 340) / 2),
                    cutT: Math.ceil((windowWRPX / innerAspectRadio - (windowWRPX / innerAspectRadio - 20)) / 2),
                    // 图片缩放值
                    scaleP: res.width * pixelRatio / windowWRPX,
                    // 图片原始宽度 rpx
                    imageW: res.width * pixelRatio,
                    imageH: res.height * pixelRatio
                  })
                else {
                  _this.setData({
                    cropperW: windowWRPX * innerAspectRadio,
                    cropperH: windowWRPX,
                    // 初始化left right
                    cropperL: Math.ceil((windowWRPX - windowWRPX * innerAspectRadio) / 2),
                    cropperT: Math.ceil((windowWRPX - windowWRPX) / 2),
                    // 裁剪框的宽高
                    // cutW: windowWRPX * innerAspectRadio - 66,
                    // cutH: 400,
                    cutL: Math.ceil((windowWRPX * innerAspectRadio - (windowWRPX * innerAspectRadio - 20)) / 2),
                    cutT: Math.ceil((windowWRPX - 340) / 2),
                    // 图片缩放值
                    scaleP: res.width * pixelRatio / windowWRPX,
                    // 图片原始宽度 rpx
                    imageW: res.width * pixelRatio,
                    imageH: res.height * pixelRatio
                  })
                }
                _this.setData({
                  isShowImg: true
                })
                wx.hideLoading()
              }
            })
     
            // end
          }
        })
      },
      /**
       * 生命周期函数--监听页面显示
       */
      onShow: function () {
       
      },
     
      /**
       * 生命周期函数--监听页面隐藏
       */
      onHide: function () {
       
      },
     
      /**
       * 生命周期函数--监听页面卸载
       */
      onUnload: function () {
       
      },
     
      /**
       * 页面相关事件处理函数--监听用户下拉动作
       */
      onPullDownRefresh: function () {
       
      },
     
      /**
       * 页面上拉触底事件的处理函数
       */
      onReachBottom: function () {
       
      },
     
      /**
       * 用户点击右上角分享
       */
      onShareAppMessage: function () {
       
      }
    })

      

     wxss:
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    /* pages/wx-cropper/index.wxss */
    .fixed-upimg{
        positionfixed;
      top0;
      left0;
      right0;
      bottom0;
      background-color#fff;
    }
    .wx-content-info{
      positionfixed;
      top130rpx;
      left0;
      right0;
      bottom0;
     
    }
     
    .wx-corpper{
      positionrelative;
      overflowhidden;
      -webkit-user-select: none;
      -moz-user-select: none;
      -ms-user-select: none;
      user-select: none;
      -webkit-tap-highlight-colortransparent;
      -webkit-touch-callout: none;
      box-sizing: border-box;
    }
     
    .wx-corpper-content{
        positionabsolute;
        top0;
        right0;
        bottom0;
        left0;
    }
     
    .wx-corpper-content image {
        displayblock;
        width100%;
        min-width0 !important;
        max-widthnone !important;
        height100%;
        min-height0 !important;
        max-heightnone !important;
        image-orientation: 0deg !important;
        margin0 auto;
    }
     
    /* 移动图片效果 */
    .wx-cropper-drag-box{
        positionabsolute;
        top0;
        right0;
        bottom0;
        left0;
        cursormove;
        background: rgba(0,0,0,0.6);
        z-index1;
    }
     
    /* 内部的信息 */
    .wx-corpper-crop-box{
        positionabsolute;
        width500rpx;
        height500rpx;
        background: rgba(255,255,255,0.3);
        z-index2;
    }
     
    .wx-corpper-crop-box .wx-cropper-view-box {
        positionrelative;
        displayblock;
        width100%;
        height100%;
        overflowvisible;
        outline1px solid #69f;
        outline-color: rgba(102153255, .75)
    }
     
    /* 横向虚线 */
    .wx-cropper-dashed-h{
        positionabsolute;
        top33.33333333%;
        left0;
        width100%;
        height33.33333333%;
        border-top1px dashed rgba(255,255,255,0.5);
        border-bottom1px dashed rgba(255,255,255,0.5);
    }
     
    /* 纵向虚线 */
    .wx-cropper-dashed-v{
        positionabsolute;
        left33.33333333%;
        top0;
        width33.33333333%;
        height100%;
        border-left1px dashed rgba(255,255,255,0.5);
        border-right1px dashed rgba(255,255,255,0.5);
    }
     
    /* 四个方向的线  为了之后的拖动事件*/
    .wx-cropper-line-t{
        positionabsolute;
        displayblock;
        width100%;
        background-color#69f;
        top0;
        left0;
        height1px;
        opacity: 0.1;
        cursorn-resize;
    }
     
    .wx-cropper-line-t::before{
      content'';
      positionabsolute;
      top50%;
      right0rpx;
      width100%;
      -webkit-transform: translate3d(0,-50%,0);
      transform: translate3d(0,-50%,0);
      bottom0;
      height41rpx;
      backgroundtransparent;
      z-index11;
    }
     
    .wx-cropper-line-r{
        positionabsolute;
        displayblock;
        background-color#69f;
        top0;
        right0px;
        width1px;
        opacity: 0.1;
        height100%;
        cursore-resize;
    }
    .wx-cropper-line-r::before{
      content'';
      positionabsolute;
      top0;
      left50%;
      width41rpx;
      -webkit-transform: translate3d(-50%,0,0);
      transform: translate3d(-50%,0,0);
      bottom0;
      height100%;
      backgroundtransparent;
      z-index11;
    }
     
    .wx-cropper-line-b{
        positionabsolute;
        displayblock;
        width100%;
        background-color#69f;
        bottom0;
        left0;
        height1px;
        opacity: 0.1;
        cursors-resize;
    }
     
    .wx-cropper-line-b::before{
      content'';
      positionabsolute;
      top50%;
      right0rpx;
      width100%;
      -webkit-transform: translate3d(0,-50%,0);
      transform: translate3d(0,-50%,0);
      bottom0;
      height41rpx;
      backgroundtransparent;
      z-index11;
    }
     
    .wx-cropper-line-l{
        positionabsolute;
        displayblock;
        background-color#69f;
        top0;
        left0;
        width1px;
        opacity: 0.1;
        height100%;
        cursorw-resize;
    }
    .wx-cropper-line-l::before{
      content'';
      positionabsolute;
      top0;
      left50%;
      width41rpx;
      -webkit-transform: translate3d(-50%,0,0);
      transform: translate3d(-50%,0,0);
      bottom0;
      height100%;
      backgroundtransparent;
      z-index11;
    }
     
    .wx-cropper-point{
        width5px;
        height5px;
        background-color#69f;
        opacity: .75;
        positionabsolute;
        z-index3;
    }
     
    .point-t{
        top-3px;
        left50%;
        margin-left-3px;
        cursorn-resize;
    }
     
    .point-tr{
        top-3px;
        left100%;
        margin-left-3px;
        cursorn-resize;
    }
     
    .point-r{
        top50%;
        left:100%;
        margin-left-3px;
        margin-top-3px;
        cursorn-resize;
    }
     
    .point-rb{
        left100%;
        top100%;
        -webkit-transform: translate3d(-50%,-50%,0);
        transform: translate3d(-50%,-50%,0);
        cursorn-resize;
        width24rpx;
        height24rpx;
        background-color#69f;
        positionabsolute;
        z-index1112;
        opacity: 1;
    }
     
    .point-b{
        left:50%;
        top100%;
        margin-left-3px;
        margin-top-3px;
        cursorn-resize;
    }
     
    .point-bl{
        left:0%;
        top100%;
        margin-left-3px;
        margin-top-3px;
        cursorn-resize;
    }
     
    .point-l{
        left:0%;
        top50%;
        margin-left-3px;
        margin-top-3px;
        cursorn-resize;
    }
     
    .point-lt{
        left:0%;
        top0%;
        margin-left-3px;
        margin-top-3px;
        cursorn-resize;
    }
     
    /* 裁剪框预览内容 */
    .wx-cropper-viewer{
      positionrelative;
      width100%;
      height100%;
      overflowhidden;
    }
     
    .wx-cropper-viewer image{
      positionabsolute;
      z-index2;
    }

    from  https://www.cnblogs.com/xiaohuizhang/p/8884253.html

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  • 原文地址:https://www.cnblogs.com/xiaobai-y/p/9084269.html
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