利用vue如何实现一个将图片压缩并上传功能
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
async getRealName(){ let nickname = this.nickname.trim() let idnum = this.idnum.trim() let nameReg = /[\u4e00-\u9fa5]/gm let idnumReg = /^[a-z0-9]+$/i let zheng1 = document.getElementById("file1").files[0] let fan1 = document.getElementById("file2").files[0] if(nickname.length < 1) { return Toast('请输入姓名') } if(idnum.length < 1) { return Toast('请输入身份证号码') } if(!zheng1) { return Toast('请上传身份证信息页') } if(!fan1) { return Toast('请上传身份证国徽页') } if(zheng1.size/1024 > 1025) { this.imgCompress(zheng1,{quality:0.2},'zheng') }else { this.zheng = zheng1 } if(fan1.size / 1024 > 1025) { this.imgCompress(fan1,{quality:0.2},'fan') }else { this.fan = fan1 } setTimeout(()=>{ let data = new FormData() data.append('nickname',nickname);//添加form表单中其他数据 data.append('idnum',idnum) data.append('zheng',this.zheng,zheng1.name) data.append("fan",this.fan,fan1.name) let apiauth = localStorage.getItem('apiauth') let config = { headers:{'Content-Type':'multipart/form-data'}, herders:{apiauth:apiauth} } axios.post("http://api139.ys11.ipfsico.com/index/index/realname",data,config).then((res)=>{ Toast(res.data.msg) if(res.data.code == 1) { this.$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 } }
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