我们借用插件安装在项目中
下面直接上图片裁剪的demo
/**************************此代码采摘官网***************************/
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<div id="app">
<div class="model" v-show="model" @click="model = false">
<div class="model-show">
<img :src="modelSrc" alt="" />
</div>
</div>
<p>例子</p>
<div class="cut">
<vue-cropper
ref="cropper"
:img="option.img"
:output-size="option.size"
:output-type="option.outputType"
:info="true"
:full="option.full"
:fixed="fixed"
:fixed-number="fixedNumber"
:can-move="option.canMove"
:can-move-box="option.canMoveBox"
:fixed-box="option.fixedBox"
:original="option.original"
:auto-crop="option.autoCrop"
:auto-crop-width="option.autoCropWidth"
:auto-crop-height="option.autoCropHeight"
:center-box="option.centerBox"
@real-time="realTime"
:high="option.high"
@img-load="imgLoad"
mode="cover"
:max-img-size="option.max"
@crop-moving="cropMoving"
mode="cover"
></vue-cropper>
</div>
<div
class="show-preview"
:style="{'width': previews.w + 'px', 'height': previews.h + 'px', 'overflow': 'hidden', 'margin': '5px'}"
>
<div :style="previews.div">
<img :src="previews.url" :style="previews.img" />
</div>
</div>
<div class="test-button">
<button @click="changeImg" class="btn">changeImg</button>
<label class="btn" for="uploads">upload</label>
<input
type="file"
id="uploads"
style="position: absolute; clip: rect(0 0 0 0)"
accept="image/png, image/jpeg, image/gif, image/jpg"
@change="uploadImg($event, 1)"
/>
<button @click="startCrop" v-if="!crap" class="btn">start</button>
<button @click="stopCrop" v-else class="btn">stop</button>
<button @click="clearCrop" class="btn">clear</button>
<button @click="refreshCrop" class="btn">refresh</button>
<button @click="changeScale(1)" class="btn">+</button>
<button @click="changeScale(-1)" class="btn">-</button>
<button @click="rotateLeft" class="btn">rotateLeft</button>
<button @click="rotateRight" class="btn">rotateRight</button>
<button @click="finish('base64')" class="btn">preview(base64)</button>
<button @click="finish('blob')" class="btn">preview(blob)</button>
<a @click="down('base64')" class="btn">download(base64)</a>
<a @click="down('blob')" class="btn">download(blob)</a>
<a @click="() => option.img = ''" class="btn">清除图片</a>
<div style="display: block; width: 100%">
<label class="c-item">
<span>上传图片是否显示原始宽高 (针对大图 可以铺满)</span>
<input type="checkbox" v-model="option.original" />
<span>original: {{ option.original}}</span>
</label>
<label class="c-item">
<span>能否拖动图片</span>
<input type="checkbox" v-model="option.canMove" />
</label>
<label class="c-item">
<span>能否拖动截图框</span>
<input type="checkbox" v-model="option.canMoveBox" />
<span>canMoveBox: {{ option.canMoveBox}}</span>
</label>
<label class="c-item">
<span>截图框固定大小</span>
<input type="checkbox" v-model="option.fixedBox" />
<span>fixedBox: {{ option.fixedBox}}</span>
</label>
<label class="c-item">
<span>是否输出原图比例的截图</span>
<input type="checkbox" v-model="option.full" />
<span>full: {{ option.full}}</span>
</label>
<label class="c-item">
<span>是否自动生成截图框</span>
<input type="checkbox" v-model="option.autoCrop" />
<span>autoCrop: {{ option.autoCrop}}</span>
</label>
<label class="c-item">
<span>是否根据dpr生成适合屏幕的高清图片</span>
<input type="checkbox" v-model="option.high" />
<span>high: {{ option.high}}</span>
</label>
<label class="c-item">
<span>截图框是否限制在图片里(只有在自动生成截图框时才能生效)</span>
<input type="checkbox" v-model="option.centerBox" />
<span>centerBox: {{ option.centerBox}}</span>
</label>
<label class="c-item">
<p>输出图片格式</p>
<label>
jpg
<input
type="radio"
name="type"
value="jpeg"
v-model="option.outputType"
/>
</label>
<label>
png
<input
type="radio"
name="type"
value="png"
v-model="option.outputType"
/>
</label>
<label>
webp
<input
type="radio"
name="type"
value="webp"
v-model="option.outputType"
/>
</label>
</label>
</div>
</div>
</div>
<!-- <script src="https://vuejs.org/js/vue.min.js"></script> -->
<script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/index.min.js"></script>
<script>
Vue.use(window['vue-cropper']);
const app = new Vue({
el: '#app',
data: {
model: false,
modelSrc: '',
crap: false,
previews: {},
lists: [
{
img: 'https://avatars2.githubusercontent.com/u/15681693?s=460&v=4',
},
],
option: {
img: 'https://avatars2.githubusercontent.com/u/15681693?s=460&v=4',
size: 1,
full: false,
outputType: 'png',
canMove: true,
fixedBox: false,
original: false,
canMoveBox: true,
autoCrop: true,
// 只有自动截图开启 宽度高度才生效
autoCropWidth: 160,
autoCropHeight: 150,
centerBox: false,
high: true,
max: 99999,
},
show: true,
fixed: true,
fixedNumber: [16, 9],
},
components: {},
methods: {
changeImg() {
this.option.img = this.lists[~~(Math.random() * this.lists.length)].img;
},
startCrop() {
// start
this.crap = true;
this.$refs.cropper.startCrop();
},
stopCrop() {
// stop
this.crap = false;
this.$refs.cropper.stopCrop();
},
clearCrop() {
// clear
this.$refs.cropper.clearCrop();
},
refreshCrop() {
// clear
this.$refs.cropper.refresh();
},
changeScale(num) {
num = num || 1;
this.$refs.cropper.changeScale(num);
},
rotateLeft() {
this.$refs.cropper.rotateLeft();
},
rotateRight() {
this.$refs.cropper.rotateRight();
},
finish(type) {
// 输出
// var test = window.open('about:blank')
// test.document.body.innerHTML = '图片生成中..'
if (type === 'blob') {
this.$refs.cropper.getCropBlob(data => {
console.log(data);
var img = window.URL.createObjectURL(data);
this.model = true;
this.modelSrc = img;
});
} else {
this.$refs.cropper.getCropData(data => {
this.model = true;
this.modelSrc = data;
});
}
},
// 实时预览函数
realTime(data) {
this.previews = data;
console.log(data);
},
finish2(type) {
this.$refs.cropper2.getCropData(data => {
this.model = true;
this.modelSrc = data;
});
},
finish3(type) {
this.$refs.cropper3.getCropData(data => {
this.model = true;
this.modelSrc = data;
});
},
down(type) {
// event.preventDefault()
var aLink = document.createElement('a');
aLink.download = 'demo';
// 输出
if (type === 'blob') {
this.$refs.cropper.getCropBlob(data => {
this.downImg = window.URL.createObjectURL(data);
aLink.href = window.URL.createObjectURL(data);
aLink.click();
});
} else {
this.$refs.cropper.getCropData(data => {
this.downImg = data;
aLink.href = data;
aLink.click();
});
}
},
uploadImg(e, num) {
//上传图片
// this.option.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;
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blob
reader.readAsArrayBuffer(file);
},
imgLoad(msg) {
console.log(msg);
},
cropMoving(data) {
console.log(data, '截图框当前坐标');
},
},
mounted: function () {
// console.log(window['vue-cropper'])
},
});
</script>
</body>
<style>
* {
margin: 0;
padding: 0;
}
.cut {
width: 500px;
height: 500px;
margin: 30px auto;
}
.c-item {
max-width: 800px;
margin: 10px auto;
margin-top: 20px;
}
.content {
margin: auto;
max-width: 1200px;
margin-bottom: 100px;
}
.test-button {
display: flex;
flex-wrap: wrap;
align-content: center;
justify-content: center;
}
.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 0.2s 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: 500px;
}
.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;
user-select: none;
}
@keyframes slide {
0% {
background-position: 0 0;
}
100% {
background-position: -100% 0;
}
}
</style>
</html>
下面是图片怎么进行压缩
在这里使用canvas
uploadimg(e) {
if (e.target.files.length == 1) {
//可以根据需求判断图片格式
// if (!/image\/\w+/.test(e.target.files.type)) {
// alert("请确保文件为图像类型");
// return false;
// }
let that = this
let fileObj = e.target.files[0];
let fileReader = new FileReader();
if (!fileReader) return
fileReader.readAsDataURL(fileObj);
fileReader.onload = function (e) {
var btn1 = document.getElementById("btn1")
btn1.setAttribute("src", fileReader.result);
that.option.img = fileReader.result
console.log(that.option.img)
let canvas = document.createElement("canvas");
let context = canvas.getContext("2d");
/***************************没有压缩后的照片*********************************/
that.nums = fileReader.result.substring(fileReader.result.indexOf(",") + 1)
// 压缩
btn1.onload = function () {
var imgWidth = this.width; //上传图片的宽
var imgHeight = this.height; //上传图片的高
var targetWidth = imgWidth; //最后图片的宽
var targetHeight = imgHeight; //最后图片的高
canvas.width = targetWidth; //canvas的宽=图片的宽
canvas.height = targetHeight; //canvas的高=图片的高
context.clearRect(0, 0, targetWidth, targetHeight); //清理canvas
context.drawImage(btn1, 0, 0, targetWidth, targetHeight); //canvas绘图
let newUrl = ""
newUrl = canvas.toDataURL("image/png", 0.92); //canvas导出成为base64
console.log(canvas.toDataURL("image/png", 0.92));
newUrl = newUrl.substring(newUrl.indexOf(",") + 1);
// that.nums = newUrl
/***************************压缩后的照片***********************************/
};
}
}
},去除base64 格式data
fileReader.result.substring(fileReader.result.indexOf(",") + 1)