本文实例为大家分享了vue图片裁剪插件vue-cropper的使用方法,供大家参考,具体内容如下
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。
以上问题以解决,base64转成blob格式就可以处理了,oss上传需要使用new Blob格式(2019/6/22更新)
另外附上文档
裁剪的vue文件:(已更新)
先下载npm install vue-cropper --save
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<!-- 裁剪图片 -->
< 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" :enlarge = "4" ></ 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($event,2)" >
< button @ click = "finish2()" class = "btn" >裁剪</ button >
</ div >
</ div >
</ div >
</ template >
< script >
import { VueCropper } from 'vue-cropper'
import * as OSS from 'ali-oss';
export default {
components: {
VueCropper,
},
data() {
return {
model: false,
modelSrc: '',
crap: false,
previews: {},
form: {
head: ''
},
example2: {
//img的路径自行修改
img: '$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.$refs.cropper2.getCropData((data) => {
this.modelSrc = data
this.model = false;
//裁剪后的图片显示
this.example2.img = this.modelSrc;
// this.toBlob(data)
// console.log(data)
// console.log(this.toBlob(data))
//阿里云处理图片,项目的接口,这里可以不用,上面的地址打印即为base64的地址
this.$api.admin.url(data => {
new OSS.Wrapper({
region: "oss-cn-hangzhou",
accessKeyId: data.accessKeyId,
accessKeySecret: data.accessKeySecret,
stsToken: data.securityToken,
// bucket: 'mybg'c
bucket: 'zhiyuan-hz'
})
.put(data.key, this.toBlob(this.example2.img))
.then(data => {
console.log(data.url)
})
.catch(function (err) {
console.error("error: %j", err);
});
});
})
},
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)
},
// base64转blob
toBlob(ndata) {
//ndata为base64格式地址
console.log(ndata)
let arr = ndata.split(','),
mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]),
n = bstr.length,
u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], {
type: mime
})
}
},
}
</ 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 >
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以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/xr510002594/article/details/82876234