<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input type="file" name="" id="myimg"><button>上传</button>
<script>
// 图片预览
let myimg = document.querySelector("#myimg");
myimg.onchange = function(){
// 获取文件对象
console.log(this.files[0]);
let file = this.files[0]
// 把文件对象转成base64格式
let FR = new FileReader();
FR.readAsDataURL(file); // 把 文件作为 url读取出来
FR.onload = function(){
// 获取读取的结果
console.log(this.result);
let imgEle = document.createElement("img");
imgEle.src = this.result;
document.body.appendChild(imgEle);
}
}
</script>
</body>
</html>
