基于cropper.js封装vue实现在线图片裁剪组件功能

npm install cropper# orbower install cropper

<script src="/path/to/jquery.js"></script><!-- jQuery is required --><link href="/path/to/cropper.css" rel="external nofollow" rel="stylesheet"><script src="/path/to/cropper.js"></script>

<!-- Wrap the image or canvas element with a block element (container) --><div> ![](picture.jpg)</div>

/* Limit image width to avoid overflow the container */img { max-width: 100%; /* This rule is very important, please do not ignore this! */}

$('#image').cropper({ aspectRatio: 16 / 9, crop: function(e) { // Output the result data for cropping image. console.log(e.x); console.log(e.y); console.log(e.width); console.log(e.height); console.log(e.rotate); console.log(e.scaleX); console.log(e.scaleY); }});

<!-- input框 --><input id="myCropper-input" type="file" :accept="imgCropperData.accept" ref="inputer" @change="handleFile">//模拟点击document.getElementById('myCropper-input').click();

// imgCropperData: {// accept: 'image/gif, image/jpeg, image/png, image/bmp',// }handleFile (e) { let _this = this; let inputDOM = this.$refs.inputer; // 通过DOM取文件数据 _this.file = inputDOM.files[0]; // 判断文件格式 if (_this.imgCropperData.accept.indexOf(_this.file.type) == -1) { _this.$Modal.error({  title: '格式错误',  content: '您选择的图片格式不正确！' }); return; } // 判断文件大小限制 if (_this.file.size > 5242880) { _this.$Modal.error({  title: '超出限制',  content: '您选择的图片过大，请选择5MB以内的图片！' }); return; } var reader = new FileReader(); // 将图片将转成 base64 格式 reader.readAsDataURL(_this.file); reader.onload = function () { _this.imgCropperData.imgSrc = this.result; _this.initCropper(); }}

// 初始化剪切 initCropper () { let _this = this; // 初始化裁剪区域 _this.imgObj = $('![](' + _this.imgCropperData.imgSrc + ')'); let $avatarPreview = $('.avatar-preview'); $('#myCropper-workspace').empty().html(_this.imgObj); _this.imgObj.cropper({  aspectRatio: _this.proportionX / _this.proportionY,  preview: $avatarPreview,  crop: function(e) {  } }); }

let $imgData = _this.imgObj.cropper('getCroppedCanvas')imgBase64Data = $imgData.toDataURL('image/png');

// 构造上传图片的数据let formData = new FormData();// 截取字符串let photoType = imgBase64Data.substring(imgBase64Data.indexOf(",") + 1);//进制转换const b64toBlob = (b64Data, contentType = '', sliceSize = 512) => { const byteCharacters = atob(b64Data); const byteArrays = []; for(let offset = 0; offset < byteCharacters.length; offset += sliceSize) { const slice = byteCharacters.slice(offset, offset + sliceSize); const byteNumbers = new Array(slice.length); for(let i = 0; i < slice.length; i++) {  byteNumbers[i] = slice.charCodeAt(i); } const byteArray = new Uint8Array(byteNumbers); byteArrays.push(byteArray); } const blob = new Blob(byteArrays, { type: contentType }); return blob;}const contentType = 'image/jepg';const b64Data2 = photoType;const blob = b64toBlob(b64Data2, contentType);formData.append("file", blob, "client-camera-photo.png")formData.append("type", _this.imgType)

//bus.jsimport Vue from 'vue'; export default new Vue();

// A.vueimport Bus from '../../components/bus/bus.js'export default { components: { Bus }, data () {}, created: function () { Bus.$on('getTarget', imgToken => {   var _this = this;  console.log(imgToken);  ...  });  }}

// B.vue// 传参Bus.$emit('getTarget', imgToken);

<template> <div class="myCropper-container"> <div id="myCropper-workspace">  <div class="myCropper-words" v-show="!imgCropperData.imgSrc">请点击按钮选择图片进行裁剪</div> </div> <div class="myCropper-preview" :class="isShort ? 'myCropper-preview-short' : 'myCropper-preview-long'">  <div class="myCropper-preview-1 avatar-preview">  ![](!imgCropperData.imgUploadSrc ? '/images/thumbnail/thumbnail-img.jpg' : imgCropperData.imgUploadSrc)  </div>  <div class="myCropper-preview-2 avatar-preview">  ![](!imgCropperData.imgUploadSrc ? '/images/thumbnail/thumbnail-img.jpg' : imgCropperData.imgUploadSrc)  </div>  <div class="myCropper-preview-3 avatar-preview">  ![](!imgCropperData.imgUploadSrc ? '/images/thumbnail/thumbnail-img.jpg' : imgCropperData.imgUploadSrc)  </div>  <input id="myCropper-input" type="file" :accept="imgCropperData.accept" ref="inputer" @change="handleFile">  <Button type="ghost" class="myCropper-btn" @click="btnClick">选择图片</Button>  <Button type="primary" class="myCropper-btn" :loading="cropperLoading" @click="crop_ok">确认</Button> </div> </div></template><script> var ezjsUtil = Vue.ezjsUtil; import Bus from './bus/bus.js'  export default { components: { Bus }, props: {  imgType: {  type: String  },  proportionX: {  type: Number  },  proportionY: {  type: Number  } }, data () {  return {  imgCropperData: {   accept: 'image/gif, image/jpeg, image/png, image/bmp',   maxSize: 5242880,   file: null, //上传的文件   imgSrc: '', //读取的img文件base64数据流   imgUploadSrc: '', //裁剪之后的img文件base64数据流  },  imgObj: null,  hasSelectImg: false,  cropperLoading: false,  isShort: false,  } }, created: function () {  let _this = this; }, mounted: function () {  let _this = this;  // 初始化预览区域  let maxWidthNum = Math.floor(300 / _this.proportionX);  let previewWidth = maxWidthNum * _this.proportionX;  let previewHeight = maxWidthNum * _this.proportionY;  if (previewWidth / previewHeight <= 1.7) {  previewWidth = previewWidth / 2;  previewHeight = previewHeight / 2;  _this.isShort = true;  }  // 设置最大预览容器的宽高  $('.myCropper-preview-1').css('width', previewWidth + 'px');  $('.myCropper-preview-1').css('height', previewHeight + 'px');  // 设置中等预览容器的宽高  $('.myCropper-container .myCropper-preview .myCropper-preview-2').css('width',( previewWidth / 2) + 'px');  $('.myCropper-container .myCropper-preview .myCropper-preview-2').css('height', (previewHeight / 2) + 'px');  // 设置最小预览容器的宽高  $('.myCropper-container .myCropper-preview .myCropper-preview-3').css('width',( previewWidth / 4) + 'px');  $('.myCropper-container .myCropper-preview .myCropper-preview-3').css('height', (previewHeight / 4) + 'px'); }, methods: {  // 点击选择图片  btnClick () {  let _this = this;  // 模拟input点击选择文件  document.getElementById('myCropper-input').click();  },  // 选择之后的回调  handleFile (e) {  let _this = this;  let inputDOM = this.$refs.inputer;  // 通过DOM取文件数据  _this.file = inputDOM.files[0];  // 判断文件格式  if (_this.imgCropperData.accept.indexOf(_this.file.type) == -1) {   _this.$Modal.error({   title: '格式错误',   content: '您选择的图片格式不正确！'   });   return;  }  // 判断文件大小限制  if (_this.file.size > 5242880) {   _this.$Modal.error({   title: '超出限制',   content: '您选择的图片过大，请选择5MB以内的图片！'   });   return;  }  var reader = new FileReader();  // 将图片将转成 base64 格式  reader.readAsDataURL(_this.file);  reader.onload = function () {   _this.imgCropperData.imgSrc = this.result;   _this.initCropper();  }  },  // 初始化剪切  initCropper () {  let _this = this;  // 初始化裁剪区域  _this.imgObj = $('![](' + _this.imgCropperData.imgSrc + ')');  let $avatarPreview = $('.avatar-preview');  $('#myCropper-workspace').empty().html(_this.imgObj);  _this.imgObj.cropper({   aspectRatio: _this.proportionX / _this.proportionY,   preview: $avatarPreview,   crop: function(e) {   }  });  _this.hasSelectImg = true;  },  // 确认  crop_ok () {  let _this = this, imgToken = null, imgBase64Data = null;  // 判断是否选择图片  if (_this.hasSelectImg == false) {   _this.$Modal.error({   title: '裁剪失败',   content: '请选择图片，然后进行裁剪操作！'   });   return false;  }  // 确认按钮不可用  _this.cropperLoading = true;  let $imgData = _this.imgObj.cropper('getCroppedCanvas')  imgBase64Data = $imgData.toDataURL('image/png');   // 构造上传图片的数据  let formData = new FormData();  // 截取字符串  let photoType = imgBase64Data.substring(imgBase64Data.indexOf(",") + 1);  //进制转换    const b64toBlob = (b64Data, contentType = '', sliceSize = 512) => {     const byteCharacters = atob(b64Data);     const byteArrays = [];     for(let offset = 0; offset < byteCharacters.length; offset += sliceSize) {      const slice = byteCharacters.slice(offset, offset + sliceSize);      const byteNumbers = new Array(slice.length);      for(let i = 0; i < slice.length; i++) {       byteNumbers[i] = slice.charCodeAt(i);      }      const byteArray = new Uint8Array(byteNumbers);      byteArrays.push(byteArray);     }     const blob = new Blob(byteArrays, {      type: contentType     });     return blob;  }  const contentType = 'image/jepg';    const b64Data2 = photoType;  const blob = b64toBlob(b64Data2, contentType);  formData.append("file", blob, "client-camera-photo.png")  formData.append("type", _this.imgType)  // ajax上传  $.ajax({     url: _this.$nfs.uploadUrl,     method: 'POST',     data: formData,     // 默认为true，设为false后直到ajax请求结束(调完回掉函数)后才会执行$.ajax(...)后面的代码     async: false,     // 下面三个，因为直接使用FormData作为数据，contentType会自动设置，也不需要jquery做进一步的数据处理(序列化)。     cache: false,     contentType: false,   processData: false,   type: _this.imgType,     success: function(res) {   let imgToken = res.data.token;   _this.cropperLoading = false;   // 传参   Bus.$emit('getTarget', imgToken);      },     error: function(error) {   _this.cropperLoading = false;   _this.$Modal.error({    title: '系统错误',    content: '请重新裁剪图片进行上传！'   });     }    });  }, } }</script><style lang="less" scoped> .myCropper-container { height: 400px; } .myCropper-container #myCropper-input { width: 0px; height: 0px; } .myCropper-container #myCropper-workspace { width: 500px; height: 400px; border: 1px solid #dddee1; float: left; } // 裁剪图片未选择图片的提示文字 .myCropper-container #myCropper-workspace .myCropper-words{ text-align: center; font-size: 18px; padding-top: 180px; } // 裁剪图片的预览区域 .myCropper-container .myCropper-preview-long { width: 300px; } .myCropper-container .myCropper-preview-short { width: 200px; } .myCropper-container .myCropper-preview { float: left; height: 400px; margin-left: 10px; } .myCropper-container .myCropper-preview .myCropper-preview-1 { border-radius: 5px; overflow: hidden; border: 1px solid #dddee1; box-shadow: 3px 3px 3px #dddee1; img {  width: 100%;  height: 100%; } } .myCropper-container .myCropper-preview .myCropper-preview-2 { margin-top: 20px; border-radius: 5px; overflow: hidden; border: 1px solid #dddee1; box-shadow: 3px 3px 3px #dddee1; img {  width: 100%;  height: 100%; } } .myCropper-container .myCropper-preview .myCropper-preview-3 { margin-top: 20px; border-radius: 5px; overflow: hidden; border: 1px solid #dddee1; box-shadow: 3px 3px 3px #dddee1; img {  width: 100%;  height: 100%; } } // 按钮 .myCropper-btn { float: left; margin-top: 20px; margin-right: 10px; }</style>