参考连接：cropperjs官方npm库介绍
step1：npm安装插件：
cnpm install crpperjs --save
step2：html结构：
绘图内容层（在这里加一个panel标记位进行绘图层的显示和隐藏，即点击上传头像时，就让其显示。注意它的宽高必须百分比满屏!!!!）：
上传按钮
step3：style样式：
#demo #button { //这是截图按钮，样式可以自己自定义!!!!!
position: absolute;
right: 10px;
top: 10px;
width: 80px;
height: 40px;
border:none;
border-radius: 5px;
background:white;
}
#demo .container { //这是绘图层内容，注意这里的宽高必须百分比满屏!!!!否则绘图层只是图片的大小
z-index: 99;
position: fixed;
left: 0;
top: 0;
right: 0;
bottom: 0;
background:rgba(0,0,0,1);
}
#demo #image {
max-width: 100%;
}
.cropper-view-box,.cropper-face {
border-radius: 50%;
}
.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');
}
.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;
}
step4：在当前组件内引用插件：
import Cropper from 'cropperjs'
step5：声明相关变量：
data () {
return {
headerImage:'', //这里用于保存本地生成的base64格式文件（可以用于本地直接预览，也可以将其ajax传给后台）
picValue:'', //用于保存files[0]
cropper:'', //申明cropper对象
croppable:false, //这个不知道什么鬼
panel:false, //这是控制绘图层的显示和消失标记为
url:''
}
},
step5：初始化cropper插件：
mounted () {
//初始化这个裁剪框
var self = this;
var image = document.getElementById('image');
this.cropper = new Cropper(image, {
aspectRatio: 1,
viewMode: 1,
background:false,
zoomable:false,
ready: function () {
self.croppable = true;
}
});
},
step6：方法定义：
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, 0, 0, width, height);
context.globalCompositeOperation = 'destination-in';
context.beginPath();
context.arc(width / 2, height / 2, Math.min(width, height) / 2, 0, 2 * Math.PI, true);
context.fill();
return canvas;
},
postImg () {
//这边写图片的上传
}
}
完整代码:
最开始
截图成功返回本地base64
绘图层弹窗