基于cropper.js封装vue实现在线图片裁剪组件的功能

npm install cropper # or bower install cropper

 
 ![](picture.jpg) 

/* 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); } });

  //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.js import Vue from 'vue'; export default new Vue();

// A.vue import 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);