Vue中使用Vue-cropper进行图片裁剪

npm install vue-cropper --save

import { VueCropper } from 'vue-cropper'

 components: {
 	VueCropper,
 },

<!-- 裁剪图片 -->
<template>
  <div class="wrapper">
    <div class="model" v-show="model" @click="model = false">
      <div class="model-show">
        <img :src="modelSrc" alt="">
      </div>
    </div>
    <div class="content">

      <div class="show-info">
        <h2>自动生成截图框 固定比例 w : h => 4 : 3</h2>
        <div class="test">
          <vueCropper ref="cropper2"
                      :img="example2.img"
                      :outputSize="example2.size"
                      :outputType="example2.outputType"
                      :info="example2.info"
                      :canScale="example2.canScale"
                      :autoCrop="example2.autoCrop"
                      :autoCropWidth="example2.autoCropWidth"
                      :autoCropHeight="example2.autoCropHeight"
                      :fixed="example2.fixed"
                      :fixedNumber="example2.fixedNumber"
                      :enlarge="4"></vueCropper>
        </div>
        <label class="btn" for="upload2">上传</label>
        <input type="file" id="upload2" style="position:absolute; clip:rect(0 0 0 0);"
               accept="image/png, image/jpeg, image/gif, image/jpg" @change="uploadImg($event,2)">
        <button @click="finish2()" class="btn">裁剪</button>
      </div>
    </div>

  </div>
</template>

<script>
  import { VueCropper } from 'vue-cropper'
  // import * as OSS from 'ali-oss';
  export default {
    components: {
      VueCropper,
    },
    data() {
      return {
        model: false,
        modelSrc: '',
        crap: false,
        previews: {},
        form: {
          head: ''
        },
        example2: {
          //img的路径自行修改
          img: '$oss.url + \'/\' + form.head ',
          info: true,
          size: 1,
          outputType: 'jpeg',
          canScale: true,
          autoCrop: true,
          // 只有自动截图开启 宽度高度才生效
          autoCropWidth: 300,
          autoCropHeight: 250,
          fixed: true,
          // 真实的输出宽高
          infoTrue: true,
          fixedNumber: [4, 3]
        },
        downImg: '#'
      }
    },
    methods: {
      //点击裁剪，这一步是可以拿到处理后的地址
      finish2() {
        this.$refs.cropper2.getCropData((data) => {
          this.modelSrc = data
          this.model = false;
          //裁剪后的图片显示
          this.example2.img = this.modelSrc;
          // this.toBlob(data)
          // console.log(data)
          // console.log(this.toBlob(data))

          //将图片上传服务器中

        })

      },

      uploadImg(e, num) {
        //上传图片
        this.example2.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
          data = e.target.result
          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blobcs
        reader.readAsArrayBuffer(file)
      },
      // base64转blob
      toBlob(ndata) {
        //ndata为base64格式地址
        console.log(ndata)
        let arr = ndata.split(','),
          mime = arr[0].match(/:(.*?);/)[1],
          bstr = atob(arr[1]),
          n = bstr.length,
          u8arr = new Uint8Array(n);
        while (n--) {
          u8arr[n] = bstr.charCodeAt(n);
        }
        return new Blob([u8arr], {
          type: mime
        })
      }
    },

  }
</script>

<style>
  * {
    margin: 0;
    padding: 0;
  }

  .content {
    margin: auto;
    max-width: 585px;
    margin-bottom: 100px;
  }

  .test-button {
    display: flex;
    flex-wrap: wrap;
  }

  .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: 285px;
  }

  .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;
    padding: 10px 0;
    user-select: none;
  }

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

    100% {
      background-position: -100% 0;
    }
  }

  @media screen and (max-width: 1000px) {
    .content {
      max-width: 90%;
      margin: auto;
    }

    .test {
      height: 400px;
    }
  }
</style>