图片化为base64格式

<head> <meta charset="utf-8" /> <title>图片预览</title> <style type="text/css"> .global { width: 100%; height: 100%; display: flex; justify-content: center; }

.count {
width: 1000px;
height: 300px;
border: 2px solid deepskyblue;
display: flex;
justify-content: space-around;
align-items: center;
}

.count div {
width: 30%;
height: 50%;
border: 1px solid fuchsia;
display: flex;
justify-content: center;
align-items: center;
}

.count div img {
height: 70%;
}

input {
display: block;
}

</head> <body> <div class="global"> <div class="count"> <div> <input type="file" name="file" id="file"> <img src="" alt="" id="imgs"> </div> </div> </div> <script type="text/javascript"> // 文件类型转换 // File 转 Base64 图片预览 const fileToBase64 = (file, callback) => { const reader = new FileReader() reader.onload = function (evt) { if (typeof callback === 'function') { callback(evt.target.result) } else { console.log("我是base64:", evt.target.result); }

}
/* readAsDataURL 方法会读取指定的 Blob 或 File 对象
** 读取操作完成的时候,会触发 onload 事件
* result 属性将包含一个data:URL格式的字符串(base64编码)以表示所读取文件的内容。
*/
reader.readAsDataURL(file);
}
//

let _files = document.getElementById('file')
_files.addEventListener('change', function (e) {
console.log(e.target.files[0])
let file = e.target.files[0] // file对象
const base64 = fileToBase64(file, base64 => {
let imgs = document.getElementById('imgs')
imgs.src = base64
console.log(base64)
})
})

</script> </body>
posted @ 2022-01-14 11:28  Fen~  阅读(80)  评论(0)    收藏  举报