基于vue的图片裁剪插件vue-cropper

我在网上找了很多关于vue裁剪图片的文章，demo都太长了，实在是太长了。有些还都看不懂，最后还是用了个大佬的demo，但是项目实践过程中还是有问题没解决。先介绍吧。效果是下面这样的，

我这里采用了4:3的固定比例进行裁剪，裁剪后的效果

但是裁剪后的图片路径是base64，超级长的路径，最终还是需要处理地址传给后端的，项目用oss处理图片，最终获得一个类似于aad68a8fd577464dbcdead2e9b20084d这个的后缀传给后端，base64的路径有几万几十万个字符，传给后端会炸的吧。

后来我通过oss进行处理，把base64的路径地址变成通过oss解析过的地址，但是！解析过的地址让我下载，下载的文件不是图片格式，记事本打开文件里面还是base64的路径，复制粘贴，没错，是裁剪之后的图片，这个问题暂时还没有解决，解决之后进行再回来修改。先附上代码吧。这里代码是比较全的，图片地址解析那一部分可以不用。

裁剪的vue文件：

先下载npm install vue-cropper --save

<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"
          ></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'
    //记得导入code文件
  import codes from '../code'
  import * as OSS from 'ali-oss';
  export default {
    data: function () {
      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;

            //阿里云处理图片，项目的接口，这里可以不用，上面的地址打印即为base64的地址
            this.$api.random(random => {
              this.$api.upload.oss(data => {
                new OSS.Wrapper({
                    //这里应该是有自己的配置的
                  region: 'oss-cn-hangzhou',
                  accessKeyId: data.accessKeyId,
                  accessKeySecret: data.accessKeySecret,
                  stsToken: data.securityToken,
                  bucket: 'zhiyuan-hz'    
                }).put(random.uuid,new Buffer(this.example2.img)).then(data => {
                  this.form.head = data.name;
                  this.modelSrc = this.form.head;
                  console.log(this.modelSrc)
                }).catch(function (err) {
                  console.error('error: %j', err);
                });
              });
            },{});

          // console.log(this.modelSrc)
        })

      },

      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)
      },
    },
    components: {
      vueCropper,
      codes
    },
  }
</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>

code.vue

<template>
  <section :class="{'preview': !all, 'all': all}">
    <code class="language-html">
       <slot name="body"></slot>
    </code>
    <div class="show" @click="() => all = !all">{{ msg }}</div>
  </section>
</template>

<script>
export default {
  data: function () {
    return {
      all: false
    }
  },
  computed: {
    msg () {
      return !this.all ? 'unfold' : 'fold'
    }
  }
}
</script>

<style lang="css" scoped>
section 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;
}

.preview {
  position: relative;
  height: 150px;
  overflow: hidden;
}

.all{
  position: relative;
}

.show {
  position: absolute;
  width: 100%;
  text-align: center;
  left: 0;
  bottom: 0;
  line-height: 50px;
  height: 50px;
  cursor: pointer;
  background-color: rgba(255, 255, 255, 0.3);
  color: white;
}
</style>