本⽂实例为⼤家分享了Vue移动端实现图⽚上传及超过1M压缩上传的具体代码,供⼤家参考,具体内容如下1、实现效果
2、代码Html:
Css:使⽤了less ,需要引⼊less,才能使⽤(npm install less less-loader --save)
.choosePic{
margin: 0.64rem 0; .pics{
background-position: center; background-size: cover; width: 15.1467rem; height: 5.5467rem;
background-color: #F9F9F9; border: 2px solid #C3C3C3; display: flex;
justify-content: center; align-items: center; font-size: 1rem; color: #3DCA9A; font-weight: bold;
border-radius: 0.213rem; >div{
margin-left: 0.213rem; letter-spacing: 2px }
.uploads{
position: absolute; z-index: 99; left: 0;
width: 99%;
height: 5.5467rem; opacity: 0; } img{
width: 1.4933rem; height: 1.4933rem; } } }
JS:
/**
* 上传销售记录 */
uploadserpRecords (e) { let file = e.target.files[0]
if (file === undefined) { return }
if (file.size / 1024 > 1025) { // ⽂件⼤于1M(根据需求更改),进⾏压缩上传 that.photoCompress(file, { // 调⽤压缩图⽚⽅法 quality: 0.2
}, function (base64Codes) {
// console.log(\"压缩后:\" + base.length / 1024 + \" \" + base); let bl = that.base64UrlToBlob(base64Codes)
// file.append('file', bl, 'file_' + Date.parse(new Date()) + '.jpg') // ⽂件对象 that.uploadLice(bl) // 请求图⽚上传接⼝ })
} else { // ⼩于等于1M 原图上传 this.uploadLice(file) }}, /**
* base64 转 Blob 格式 和file格式 */
base64UrlToBlob (urlData) { let arr = urlData.split(','),
mime = arr[0].match(/:(.*?);/)[1], // 去掉url的头,并转化为byte bstr = atob(arr[1]), // 处理异常,将ascii码⼩于0的转换为⼤于0 n = bstr.length,
u8arr = new Uint8Array(n) while (n--) {
u8arr[n] = bstr.charCodeAt(n) }
// 转blob
// return new Blob([u8arr], {type: mime})
let filename = Date.parse(new Date()) + '.jpg' // 转file
return new File([u8arr], filename, {type: mime})}, /*
压缩图⽚
file:⽂件(类型是图⽚格式),
obj:⽂件压缩后对象width, height, quality(0-1) callback:容器或者回调函数*/
photoCompress (file, obj, callback) { let that = this
let ready = new FileReader()
/* 开始读取指定File对象中的内容. 读取操作完成时,返回⼀个URL格式的字符串. */ ready.readAsDataURL(file) ready.onload = function () { let re = this.result
that.canvasDataURL(re, obj, callback) // 开始压缩 }},
/* 利⽤canvas数据化图⽚进⾏压缩 *//* 图⽚转base64 */
canvasDataURL (path, obj, callback) { let img = new Image() img.src = path
img.onload = function () { let that = this // 指到img // 默认按⽐例压缩 let w = that.width, h = that.height, scale = w / h w = obj.width || w
h = obj.height || (w / scale)
let quality = 0.2 // 默认图⽚质量为0.7 // ⽣成canvas
let canvas = document.createElement('canvas') let ctx = canvas.getContext('2d') // 创建属性节点
let anw = document.createAttribute('width') anw.nodeValue = w
let 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
let base64 = canvas.toDataURL('image/jpeg', quality) // 回调函数返回base64的值 callback(base64) }},
// 返回file⽂件,调⽤接⼝执⾏上传uploadLice (file) { console.log(file)
uploadLog(file, (data) => {
this.form.operatingLicense = data console.log(data) })},
关于vue.js组件的教程,请⼤家点击专题进⾏学习。更多vue学习教程请阅读专题
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