需求：

上傳到服務(wù)器的圖片太大會導(dǎo)致服務(wù)器承受不了，故在前端傳圖片的時候?qū)D片壓縮后再傳到服務(wù)器

直接上代碼

async getRealName(){ let nickname = this.nickname.trim() let idnum = this.idnum.trim() let nameReg = /[u4e00-u9fa5]/gm let idnumReg = /^[a-z0-9]+$/i let zheng1 = document.getElementById('file1').files[0] let fan1 = document.getElementById('file2').files[0] if(nickname.length < 1) { return Toast(’請輸入姓名’) } if(idnum.length < 1) { return Toast(’請輸入身份證號碼’) } if(!zheng1) { return Toast(’請上傳身份證信息頁’) } if(!fan1) { return Toast(’請上傳身份證國徽頁’) } if(zheng1.size/1024 > 1025) { this.imgCompress(zheng1,{quality:0.2},’zheng’) }else { this.zheng = zheng1 } if(fan1.size / 1024 > 1025) { this.imgCompress(fan1,{quality:0.2},’fan’) }else { this.fan = fan1 } setTimeout(()=>{ let data = new FormData() data.append(’nickname’,nickname);//添加form表單中其他數(shù)據(jù) data.append(’idnum’,idnum) data.append(’zheng’,this.zheng,zheng1.name) data.append('fan',this.fan,fan1.name) let apiauth = localStorage.getItem(’apiauth’) let config = { headers:{’Content-Type’:’multipart/form-data’}, herders:{apiauth:apiauth} } axios.post('http://api139.ys11.ipfsico.com/index/index/realname',data,config).then((res)=>{ Toast(res.data.msg) if(res.data.code == 1) { this.$router.replace({path:’/msite’}) } }) },1000) }, //圖片壓縮 imgCompress(path,obj,statu){ let _this = this //這里的this 是把vue的實例對象指向改變?yōu)開this var img = new Image(); if(statu == ’zheng’) { img.src = _this.avatar1; }else { img.src = _this.avatar2 } img.onload = function(){ var that = this; //這里的this 是把img的對象指向改變?yōu)閠hat // 默認按比例壓縮 var w = that.width, h = that.height, scale = w / h; w = obj.width || w; h = obj.height || (w / scale); var quality = 0.7; // 默認圖片質(zhì)量為0.7 //生成canvas var canvas = document.createElement(’canvas’); var ctx = canvas.getContext(’2d’); // 創(chuàng)建屬性節(jié)點 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); // 圖像質(zhì)量 if(obj.quality && obj.quality <= 1 && obj.quality > 0){ quality = obj.quality; } // quality值越小，所繪制出的圖像越模糊 var base64 = canvas.toDataURL(’image/jpeg’, quality); // 回調(diào)函數(shù)返回base64的值 var urlFile = _this.convertBase64UrlToBlob(base64) //這個地方的處理是為了把壓縮的base64轉(zhuǎn)化為對象，獲得壓縮后圖片的大小size，方便對壓縮后的圖片再次進行判斷； // 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('圖片過大，請重新上傳圖片') } } }, 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(’您上傳的圖片過大,請重新選擇’) 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(’暫不支持該類型圖片’); 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(’暫不支持該類型圖片’); 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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