vue中使用cropperjs的方法

Vue 2019-01-07

用vue的项目里需要对图片进行裁剪，于是使用了cropperjs，在使用的过程中也踩过一些坑，以下是在.vue文件里cropperjs的使用方法和经验教训总结：

在使用之前，先引入：

这里写图片描述

在项目里，运行：

在template里：

viewmode: 1,background:false,zoomable:false,ready: function () { self.croppable = true; } }); },methods: { getObjectURL (file) { var url = null ; if (window.createObjectURL!=undefined) { // basic url = window.createObjectURL(file) ; } else if (window.URL!=undefined) { // mozilla(firefox) url = window.URL.createObjectURL(file) ; } else if (window.webkitURL!=undefined) { // webkit or chrome url = window.webkitURL.createObjectURL(file) ; } return url ; },change (e) { let files = e.target.files || e.dataTransfer.files; if (!files.length) return; this.panel = true; this.picValue = files[0]; this.url = this.getObjectURL(this.picValue); //每次替换图片要重新得到新的url if(this.cropper){ this.cropper.replace(this.url); } this.panel = true; },crop () { this.panel = false; var croppedCanvas; var roundedCanvas; if (!this.croppable) { return; } // Crop croppedCanvas = this.cropper.getCroppedCanvas(); console.log(this.cropper) // Round roundedCanvas = this.getRoundedCanvas(croppedCanvas); this.headerImage = roundedCanvas.toDataURL(); this.postImg() },getRoundedCanvas (sourceCanvas) { var canvas = document.createElement('canvas'); var context = canvas.getContext('2d'); var width = sourceCanvas.width; var height = sourceCanvas.height; canvas.width = width; canvas.height = height; context.imageSmoothingEnabled = true; context.drawImage(sourceCanvas,width,height); context.globalCompositeOperation = 'destination-in'; context.beginPath(); context.arc(width / 2,height / 2,Math.min(width,height) / 2,2 * Math.PI,true); context.fill(); return canvas; },postImg () { //这边写图片的上传 } } }

整体效果：

这里写图片描述

css代码（比较长，本来想不贴上了，但是为了一下童鞋可以直接运行demo，还是贴上了，篇幅过长，望见谅）：

Box,.cropper-face { border-radius: 50%; } /*! * Cropper.js v1.0.0-rc * https://github.com/fengyuanchen/cropperjs * * Copyright (c) 2017 Fengyuan Chen * Released under the MIT license * * Date: 2017-03-25T12:02:21.062Z */ .cropper-container { font-size: 0; line-height: 0; position: relative; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; direction: ltr; -ms-touch-action: none; touch-action: none } .cropper-container img { /* Avoid margin top issue (Occur only when margin-top <= -height) */ display: block; min-width: 0 !important; max-width: none !important; min-height: 0 !important; max-height: none !important; width: 100%; height: 100%; image-orientation: 0deg } .cropper-wrap-Box,.cropper-canvas,.cropper-drag-Box,.cropper-crop-Box,.cropper-modal { position: absolute; top: 0; right: 0; bottom: 0; left: 0; } .cropper-wrap-Box { overflow: hidden; } .cropper-drag-Box { opacity: 0; background-color: #fff; } .cropper-modal { opacity: .5; background-color: #000; } .cropper-view-Box { display: block; overflow: hidden; width: 100%; height: 100%; outline: 1px solid #39f; outline-color: rgba(51,153,255,0.75); } .cropper-dashed { position: absolute; display: block; opacity: .5; border: 0 dashed #eee } .cropper-dashed.dashed-h { top: 33.33333%; left: 0; width: 100%; height: 33.33333%; border-top-width: 1px; border-bottom-width: 1px } .cropper-dashed.dashed-v { top: 0; left: 33.33333%; width: 33.33333%; height: 100%; border-right-width: 1px; border-left-width: 1px } .cropper-center { position: absolute; top: 50%; left: 50%; display: block; width: 0; height: 0; opacity: .75 } .cropper-center:before,.cropper-center:after { position: absolute; display: block; content: ' '; background-color: #eee } .cropper-center:before { top: 0; left: -3px; width: 7px; height: 1px } .cropper-center:after { top: -3px; left: 0; width: 1px; height: 7px } .cropper-face,.cropper-line,.cropper-point { position: absolute; display: block; width: 100%; height: 100%; opacity: .1; } .cropper-face { top: 0; left: 0; background-color: #fff; } .cropper-line { background-color: #39f } .cropper-line.line-e { top: 0; right: -3px; width: 5px; cursor: e-resize } .cropper-line.line-n { top: -3px; left: 0; height: 5px; cursor: n-resize } .cropper-line.line-w { top: 0; left: -3px; width: 5px; cursor: w-resize } .cropper-line.line-s { bottom: -3px; left: 0; height: 5px; cursor: s-resize } .cropper-point { width: 5px; height: 5px; opacity: .75; background-color: #39f } .cropper-point.point-e { top: 50%; right: -3px; margin-top: -3px; cursor: e-resize } .cropper-point.point-n { top: -3px; left: 50%; margin-left: -3px; cursor: n-resize } .cropper-point.point-w { top: 50%; left: -3px; margin-top: -3px; cursor: w-resize } .cropper-point.point-s { bottom: -3px; left: 50%; margin-left: -3px; cursor: s-resize } .cropper-point.point-ne { top: -3px; right: -3px; cursor: ne-resize } .cropper-point.point-nw { top: -3px; left: -3px; cursor: nw-resize } .cropper-point.point-sw { bottom: -3px; left: -3px; cursor: sw-resize } .cropper-point.point-se { right: -3px; bottom: -3px; width: 20px; height: 20px; cursor: se-resize; opacity: 1 } @media (min-width: 768px) { .cropper-point.point-se { width: 15px; height: 15px } } @media (min-width: 992px) { .cropper-point.point-se { width: 10px; height: 10px } } @media (min-width: 1200px) { .cropper-point.point-se { width: 5px; height: 5px; opacity: .75 } } .cropper-point.point-se:before { position: absolute; right: -50%; bottom: -50%; display: block; width: 200%; height: 200%; content: ' '; opacity: 0; background-color: #39f } .cropper-invisible { opacity: 0; } .cropper-bg { background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAA3NCSVQICAjb4U/gAAAABlBMVEXMzMz////TjRV2AAAACXBIWXMAAArrAAAK6wGCiw1aAAAAHHRFWHRTb2Z0d2FyZQBBZG9iZSBGaXJld29ya3MgQ1M26LyyjAAAABFJREFUCJlj+M/AgBVhF/0PAH6/D/HkDxOGAAAAAElFTkSuQmCC'); } .cropper-hide { position: absolute; display: block; width: 0; height: 0; } .cropper-hidden { display: none !important; } .cropper-move { cursor: move; } .cropper-crop { cursor: crosshair; } .cropper-disabled .cropper-drag-Box,.cropper-disabled .cropper-face,.cropper-disabled .cropper-line,.cropper-disabled .cropper-point { cursor: not-allowed; }

整体图：

这里写图片描述