2017/2/17本地上传图片展示（未向后台发送）

来源：互联网发布：js获取input的name值编辑：程序博客网时间：2024/04/28 20:46

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="file" id="photo">
<div id="click" style="width: 200px; height: 200px; border: 1px solid #000;"></div>
<script>
document.getElementById('photo').addEventListener('change',function(e){
console.log(this)
var files = this.files;
console.log(files)
var img = new Image();
var reader = new FileReader();
reader.readAsDataURL(files[0]);
reader.onload = function(e){
console.log(e)
var mb = (e.total/1024)/1024;
if(mb>= 2){
alert('文件大小大于2M');
return;
}
img.src = this.result;
img.style.width = "80%";
document.getElementById('click').style.width="200px";
document.getElementById('click').style.height="200px";
document.getElementById('click').innerHTML = '';
document.getElementById('click').appendChild(img);
}
});
</script>
</body>
</html>

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