<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>html5 图片上传预览</title>
<style>
#preview { width: 300px; height: 300px; overflow: hidden; } #preview img { width: 100%; height: 100%; }
</style>
<script src="jquery.min.js"></script>
<script type="text/javascript">
function preview1(file) {
var img = new Image(),
url = img.src = URL.createObjectURL(file)
var $img = $(img)
img.onload = function() {
URL.revokeObjectURL(url)
$(‘#preview‘).empty().append($img)
} }
// function preview2(file) {
// var reader = new FileReader()
// reader.onload = function(e) {
// var $img = $(‘<img>‘).attr("src", e.target.result)
// $(‘#preview‘).empty().append($img)
// }
// reader.readAsDataURL(file)
}
$(function() {
$(‘[type=file]‘).change(function(e) {
var file = e.target.files[0]
preview1(file)
})
})
</script>
</head>
<body>
<form enctype="multipart/form-data" action="" method="post">
<input type="file" name="imageUpload"/>
<div id="preview" style="width: 300px;height:300px;border:1px solid gray;"></div>
</form>
</body>
</html>
原文：http://www.cnblogs.com/xuxuxu/p/7922388.html