今天就跟大家聊聊有关利用vue如何实现一个将图片压缩并上传功能，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
上传到服务器的图片太大会导致服务器承受不了，故在前端传图片的时候将图片压缩后再传到服务器
直接上代码
重庆分公司
重庆分公司
async getRealName(){
let nickname = this.nickname.trim()
let idnum = this.idnum.trim()
let nameReg = /[\u4e00-\u9fa5]/gm
let idnumReg = /^[a-z0-9]+$/i
let zheng1 = document.getElementById("file1").files[0]
let fan1 = document.getElementById("file2").files[0]
if(nickname.length < 1) {
return Toast('请输入姓名')
}
if(idnum.length < 1) {
return Toast('请输入身份证号码')
}
if(!zheng1) {
return Toast('请上传身份证信息页')
}
if(!fan1) {
return Toast('请上传身份证国徽页')
}
if(zheng1.size/1024 > 1025) {
this.imgCompress(zheng1,{quality:0.2},'zheng')
}else {
this.zheng = zheng1
}
if(fan1.size / 1024 > 1025) {
this.imgCompress(fan1,{quality:0.2},'fan')
}else {
this.fan = fan1
}
setTimeout(()=>{
let data = new FormData()
data.append('nickname',nickname);//添加form表单中其他数据
data.append('idnum',idnum)
data.append('zheng',this.zheng,zheng1.name)
data.append("fan",this.fan,fan1.name)
let apiauth = localStorage.getItem('apiauth')
let config = {
headers:{'Content-Type':'multipart/form-data'},
herders:{apiauth:apiauth}
}
axios.post("/tupian/20230522/domain_profile.cfm
Toast(res.data.msg)
if(res.data.code == 1) {
this.$router.replace({path:'/msite'})
}
})
},1000)
},
//图片压缩
imgCompress(path,obj,statu){
let _this = this //这里的this 是把vue的实例对象指向改变为_this
var img = new Image();
if(statu == 'zheng') {
img.src = _this.avatar1;
}else {
img.src = _this.avatar2
}
img.onload = function(){
var that = this; //这里的this 是把img的对象指向改变为that
// 默认按比例压缩
var w = that.width,
h = that.height,
scale = w / h;
w = obj.width || w;
h = obj.height || (w / scale);
var quality = 0.7; // 默认图片质量为0.7
//生成canvas
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
// 创建属性节点
var anw = document.createAttribute("width");
anw.nodeValue = w;
var anh = document.createAttribute("height");
anh.nodeValue = h;
canvas.setAttributeNode(anw);
canvas.setAttributeNode(anh);
ctx.drawImage(that, 0, 0, w, h);
// 图像质量
if(obj.quality && obj.quality <= 1 && obj.quality > 0){
quality = obj.quality;
}
// quality值越小，所绘制出的图像越模糊
var base64 = canvas.toDataURL('image/jpeg', quality);
// 回调函数返回base64的值
var urlFile = _this.convertBase64UrlToBlob(base64) //这个地方的处理是为了把压缩的base64转化为对象，获得压缩后图片的大小size，方便对压缩后的图片再次进行判断；
// console.log(urlFile)
let file = _this.blobToFile(urlFile,path.name)
console.log(file)
if(statu == 'zheng') {
_this.zheng = file
}else {
_this.fan = file
}
if(urlFile.size/1024 > 1025){
Toast("图片过大，请重新上传图片")
}
}
},
convertBase64UrlToBlob(urlData){
var arr = urlData.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});
},
blobToFile(theBlob, fileName){
theBlob.lastModifiedDate = new Date();
theBlob.name = fileName;
return theBlob;
},
changeImage(e) {
console.log(e.target.files)
if(e.target.files[0]){
this.ownImg = false
var file = e.target.files[0];
console.log(file)
let filemaxsize = 4096
let size = file.size / 1024
if (size > filemaxsize){
Toast('您上传的图片过大,请重新选择')
this.disabled = true;
this.formatImg = false
return false
}
var name = file.name
var fileTypes = [".jpg", ".png"];
if(name) {
var isNext = false;
var fileEnd = name.substring(name.indexOf("."));
for (var i = 0; i < fileTypes.length; i++) {
if (fileTypes[i] == fileEnd) {
console.log(fileTypes[i])
isNext = true;
this.disabled = false;
this.formatImg = true;
break;
}
}
if (!isNext){
Toast('暂不支持该类型图片');
name = "";
this.disabled = true;
this.formatImg = false
return false;
}
}
var reader = new FileReader()
var that = this
var image = new Image()
reader.readAsDataURL(file)
reader.onload = function(e) {
that.avatar1 = this.result
}
}
},
changeImg(event){
var file = event.target.files[0]
var name = file.name
var fileTypes = [".jpg", ".png"];
if(name) {
var isNext = false;
var fileEnd = name.substring(name.indexOf("."));
for (var i = 0; i < fileTypes.length; i++) {
if (fileTypes[i] == fileEnd) {
console.log(fileTypes[i])
isNext = true;
this.disabled = false;
this.formatImg = true;
break;
}
}
if (!isNext){
Toast('暂不支持该类型图片');
name = "";
this.disabled = true;
this.formatImg = false
return false;
}
}
var reader = new FileReader()
var that = this
reader.readAsDataURL(file)
reader.onload = function(event) {
that.avatar2 = this.result
}
} 
