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将图像文件转换为base64
直入主题,上代码(其实用的还是FileReader)
1、image转Base64
imageToBase64 (file) { var reader = new FileReader() reader.readAsDataURL(file) reader.onload = () => { console.log('file 转 base64结果:' + reader.result) this.iconBase64 = reader.result } reader.onerror = function (error) { console.log('Error: ', error) }}
2、Base64图像直接显示在标签
<el-form-item prop="iconBase64"> <img :src="iconBase64" v-show="isShow" /></el-form-item>
vue网络图片转base64
单张图片转Base64
<script> methods: {//异步执行imageUrlToBase64() {//一定要设置为let,不然图片不显示let image = new Image();//解决跨域问题image.setAttribute('crossOrigin', 'anonymous');let imageUrl = "http://img1.imgtn.bdimg.com/it/u=4012470373,3540768040&fm=26&gp=0.jpg";image.src = imageUrllet that = this;//image.onload为异步加载image.onload = () => {var canvas = document.createElement("canvas");canvas.width = image.width;canvas.height = image.height;var context = canvas.getContext('2d');context.drawImage(image, 0, 0, image.width, image.height);var quality = 0.8;//这里的dataurl就是base64类型var dataURL = canvas.toDataURL("image/jpeg", quality);//使用toDataUrl将图片转换成jpeg的格式,不要把图片压缩成png,因为压缩成png后base64的字符串可能比不转换前的长!}},}</script>
多张图片转Base64
<script> data() { return { base64Datas: [], }methods: {imageUrlToBase64(){let data = ["https://file.lsjlt.com/upload/202306/27/f4njegp0qbn.png","https://file.lsjlt.com/upload/202306/27/f4njegp0qbn.png","https://file.lsjlt.com/upload/202306/27/f4njegp0qbn.png"]this.imageUrlToBase64(data, 1, data.length);},//采用递归同步执行onloadImg(data, i, len) {//一定要设置为let,不然图片不显示let image = new Image();//解决跨域问题image.setAttribute('crossOrigin', 'anonymous');let imageUrl = "https://file.lsjlt.com/upload/202306/27/f4njegp0qbn.png";image.src = imageUrllet that = this;//image.onload为异步加载image.onload = () => {var canvas = document.createElement("canvas");canvas.width = image.width;canvas.height = image.height;var context = canvas.getContext('2d');context.drawImage(image, 0, 0, image.width, image.height);var quality = 0.8;//这里的dataurl就是base64类型var dataURL = canvas.toDataURL("image/jpeg", quality);//使用toDataUrl将图片转换成jpeg的格式,不要把图片压缩成png,因为压缩成png后base64的字符串可能比不转换前的长!//数组存放图片base64that.base64Datas.push(dataURL);//递归执行图片url转base64i = i + 1;if (i <= len) {that.onloadImg(data1, i, len)}}},}</script>
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