vue-cropper 图片裁剪上传的使用

vue-cropper文档

安装

npm install vue-cropper

使用

import VueCropper from 'vue-cropper' 
Vue.use(VueCropper)

模板
注意外部要包裹一个总的盒子

  <div>
    <div class="model" v-show="model" @click="model = false">
      <div class="model-show">
        <img :src="modelSrc" alt="">
      </div>
    </div>
    
    <div class="cut">
      <vue-cropper ref="cropper" :img="option.img" :output-size="option.size" :output-type="option.outputType" :info="true" :full="option.full"
                   :can-move="option.canMove" :can-move-box="option.canMoveBox" :fixed-box="option.fixedBox" :original="option.original"
                   :auto-crop="option.autoCrop" :auto-crop-width="option.autoCropWidth" :auto-crop-height="option.autoCropHeight" :center-box="option.centerBox"
                   @real-time="realTime" :high="option.high"
                   @img-load="imgLoad" ></vue-cropper>
    </div>
    <!-- 底部实时预览 -->
    <div class="show-preview" :style="{'width': previews.w + 'px', 'height': previews.h + 'px',  'overflow': 'hidden', 'margin': '5px'}">
      <div :style="previews.div">
        <img :src="previews.url" :style="previews.img">
      </div>
    </div> 
    <div class="test-button">
        <!-- <label class="btn" for="uploads">upload</label>
      <input type="file" id="uploads" style="position:absolute; clip:rect(0 0 0 0);" accept="image/png, image/jpeg, image/gif, image/jpg"
             @change="uploadImg($event, 1)"> -->
      <button @click="refreshCrop" class="btn">刷新</button>
      <button @click="changeScale(1)" class="btn">+</button>
      <button @click="changeScale(-1)" class="btn">-</button>
      <button @click="rotateLeft" class="btn">左转</button>
      <button @click="rotateRight" class="btn">右转</button>
      <button @click="finish('base64')" class="btn">预览(base64)</button>
      <!-- <button @click="finish('blob')" class="btn">preview(blob)</button> -->
      <!-- <a @click="down('base64')" class="btn">download(base64)</a> -->
      <a @click="down('blob')" class="btn">download(blob)</a>
      
    </div>
  </div>

js部分
通过绑定事件来改变cropper组件内的属性值（data中的option），来达到裁剪，放大缩小，旋转等功能
使用时要注意跨域问题，可以让后台给个接口将图片转为base64的格式

created(){
        
        //this.option.img = this.cropperimg
        // alert(this.cropperimg)
    },
    
   data() {
    return {
      items: [],
      model: false,
      modelSrc: '',
      crap: false,
      previews: {},
   
      option: {
        img:'https://qn-qn-kibey-static-cdn.app-echo.com/goodboy-weixin.PNG',
        //img: '',//裁剪图片的地址
        size: 1,
        full: false, //是否输出原图比例的截图
        outputType: 'png',//裁剪生成图片的格式
        canMove: true, //上传图片是否可以移动
        fixedBox: true, //固定截图框大小 不允许改变
        original: false, //上传图片按照原始比例渲染
        canMoveBox: true, //截图框能否拖动
        autoCrop: true, //  是否默认生成截图框
        // 只有自动截图开启 宽度高度才生效
        autoCropWidth: 300, //默认生成截图框宽度
        autoCropHeight: 168, //默认生成截图框高度
        centerBox: false, //截图框是否被限制在图片里面
        high: true  //是否按照设备的dpr 输出等比例图片
      },
      show: true
    }
  },
  computed:{
      cropperimg(){
         // return this.$store.getters['getcropperImg']
      }
  },
  
  methods: {
    
   
    refreshCrop() {
      // clear
      this.$refs.cropper.refresh()
    },
    changeScale(num) {
      num = num || 1
      this.$refs.cropper.changeScale(num)
    },
    rotateLeft() {
      this.$refs.cropper.rotateLeft()//左旋转
    },
    rotateRight() {
      this.$refs.cropper.rotateRight()//右旋转
    },
    // 截图
    finish(type) {
      // 输出
      // var test = window.open('about:blank')
      // test.document.body.innerHTML = '图片生成中..'
      if (type === 'blob') {
        this.$refs.cropper.getCropBlob((data) => {
          console.log(data);
          var img = window.URL.createObjectURL(data)
          this.model = true
          this.modelSrc = img
        })
      } else {
        this.$refs.cropper.getCropData((data) => {
            // data就是截到图片生成的base64
          this.model = true
          this.modelSrc = data
        })
      }
    },
    // 实时预览函数
    realTime(data) {
      this.previews = data
    //   console.log(data)
    },
    down(type) {
      // event.preventDefault()
      var aLink = document.createElement('a')
      aLink.download = 'demo'
      // 输出
      if (type === 'blob') {
        this.$refs.cropper.getCropBlob((data) => {
          this.downImg = window.URL.createObjectURL(data)
          aLink.href = window.URL.createObjectURL(data)
          aLink.click()
        })
      } else {
        this.$refs.cropper.getCropData((data) => {
          this.downImg = data
          aLink.href = data
          aLink.click()
        })
      }
    },

    uploadImg(e, num) {
      //上传图片
      // this.option.img
      var file = e.target.files[0]
      if (!/\.(gif|jpg|jpeg|png|bmp|GIF|JPG|PNG)$/.test(e.target.value)) {
        alert('图片类型必须是.gif,jpeg,jpg,png,bmp中的一种')
        return false
      }
      var reader = new FileReader()
      reader.onload = (e) => {
        let data
        if (typeof e.target.result === 'object') {
          // 把Array Buffer转化为blob 如果是base64不需要
          data = window.URL.createObjectURL(new Blob([e.target.result]))
        } else {
          data = e.target.result
        }
        if (num === 1) {
          this.option.img = data
        } else if (num === 2) {
          this.example2.img = data
        }
      }
      // 转化为base64
      // reader.readAsDataURL(file)
      // 转化为blob
      reader.readAsArrayBuffer(file)
    },
    imgLoad(msg) {
      console.log(msg)
    }
  }
}

css部分

h3 {
  margin: 40px 0 0;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
.hello {
  /*display: flex;*/
  flex:1;
}
.row {
  display: block;
  width: 100%;
  padding: 10px 0 10px 15px;
  font-size: 16px;
  line-height: 30px;
  color: #444;
  background-color: #fff;
}
.grey-bg {
  background-color: #eee;
}
* {
  margin: 0;
  padding: 0;
}

.cut {
  width: 500px;
  height: 500px;
  margin: 30px auto;
}

.c-item {
  max-width: 800px;
  margin: 10px auto;
  margin-top: 20px;
}

.content {
  margin: auto;
  max-width: 1200px;
  margin-bottom: 100px;
}

.test-button {
  display: flex;
  flex-wrap: wrap;
  align-content: center;
  justify-content: center;
}

.btn {
  display: inline-block;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  background: #fff;
  border: 1px solid #c0ccda;
  color: #1f2d3d;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  margin:20px 10px 0px 0px;
  padding: 9px 15px;
  font-size: 14px;
  border-radius: 4px;
  color: #fff;
  background-color: #50bfff;
  border-color: #50bfff;
  transition: all .2s ease;
  text-decoration: none;
  user-select: none;
}

.des {
  line-height: 30px;
}

code.language-html {
  padding: 10px 20px;
  margin: 10px 0px;
  display: block;
  background-color: #333;
  color: #fff;
  overflow-x: auto;
  font-family: Consolas, Monaco, Droid, Sans, Mono, Source, Code, Pro, Menlo, Lucida, Sans, Type, Writer, Ubuntu, Mono;
  border-radius: 5px;
  white-space: pre;
}

.show-info {
  margin-bottom: 50px;
}

.show-info h2 {
  line-height: 50px;
}

/*.title, .title:hover, .title-focus, .title:visited {
  color: black;
}*/

.title {
  display: block;
  text-decoration: none;
  text-align: center;
  line-height: 1.5;
  margin: 20px 0px;
  background-image: -webkit-linear-gradient(left,#3498db,#f47920 10%,#d71345 20%,#f7acbc 30%,#ffd400 40%,#3498db 50%,#f47920 60%,#d71345 70%,#f7acbc 80%,#ffd400 90%,#3498db);
  color: transparent;
  -webkit-background-clip: text;
  background-size: 200% 100%;
  animation: slide 5s infinite linear;
  font-size: 40px;
}

.test {
  height: 500px;
}

.model {
  position: fixed;
  z-index: 10;
  width: 100vw;
  height: 100vh;
  overflow: auto;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.8);
}

.model-show {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
}

.model img {
  display: block;
  margin: auto;
  max-width: 80%;
  user-select: none;
  background-position: 0px 0px, 10px 10px;
  background-size: 20px 20px;
  background-image: linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee 100%),linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);
}

.c-item {
  display: block;
  user-select: none;
}

@keyframes slide {
  0%  {
    background-position: 0 0;
  }
  100% {
    background-position: -100% 0;
  }
}