上一篇博客是上传功能，本篇是上传后图片预览和更改：
代码如下：
1.yulan.php
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
#yl{ width:200px; height:300px; background-image:url(images/timg1.jpg); background-size:200px 300px;}
#file{ width:200px; height:300px; float:left; opacity:0;}
</style>
</head>
<body>
<form id="sc" action="ylchuli.php" method="post" enctype="multipart/form-data" target="shangchuan">
<input type="hidden" name="tp" value="" id="tp" />
<div id="yl">
<input type="file" name="file" id="file" onchange="document.getelementbyid('sc').submit()" />
</div>
</form>
<iframe style="display:none" name="shangchuan" id="shangchuan">
</iframe>
</body>
<script type="text/javascript">
//回调函数,调用该方法传一个文件路径，改变背景图
function showimg(url)
{
var div = document.getelementbyid("yl");
div.style.backgroundimage = "url("+url+")";
document.getelementbyid("tp").value = url;
}
</script>
</html>
2.ylchuli.php
<?php
if($_files["file"]["error"])
{
echo $_files["file"]["error"];
}
else
{
if(($_files["file"]["type"]=="image/jpeg" || $_files["file"]["type"]=="image/png")&& $_files["file"]["size"]<1024000)
{
$fname = "./images/".date("ymdhis").$_files["file"]["name"];
$filename = iconv("utf-8","gb2312",$fname);
if(file_exists($filename))
{
echo "<script>alert('该文件已存在！');</script>";
}
else
{
move_uploaded_file($_files["file"]["tmp_name"],$filename);
$delurl = iconv("utf-8","gb2312",$_post["tp"]);
unlink($delurl); //删除文件
echo "<script>parent.showimg('{$fname}');</script>";
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持硕编程。
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