<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="file" id="photo">
<div id="click" style=" 200px; height: 200px; border: 1px solid #000;"></div>
<script>
document.getElementById('photo').addEventListener('change',function(e){
var files = this.files;
var img = new Image();
var reader = new FileReader();
reader.readAsDataURL(files[0]);
reader.onload = function(e){
var mb = (e.total/1024)/1024;
if(mb>= 2){
alert('文件大小大于2M');
return;
}
console.log(this.result);//base64
img.src = this.result;//有图片节点可以直接传输到对应节点src
img.style.width = "100%";
img.style.height= "100%";
document.getElementById('click').style.width="200px";
document.getElementById('click').style.height="200px";
document.getElementById('click').innerHTML = '';
document.getElementById('click').appendChild(img);
}
});
</script>
</body>
</html>