上一篇部落格是上傳功能，本篇是上傳後圖片預覽和更改：
代碼如下：
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>無標題文檔</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" /> <p id="yl"> <input type="file" name="file" id="file" onchange="document.getElementById('sc').submit()" /> </p> </form><iframe style="display:none" name="shangchuan" id="shangchuan"></iframe></body><script type="text/javascript">//回呼函數,調用該方法傳一個檔案路徑，改變背景圖function showimg(url){ var p = document.getElementById("yl"); p.style.backgroundImage = "url("+url+")"; document.getElementById("tp").value = url;}</script></html>
2.ylchuli.php
<?phpif($_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($filename)) { echo "<script>alert('該檔案已存在！');</script>"; } else { move_uploaded_file($_FILES["file"]["tmp_name"],$filename); $delurl = iconv("UTF-8","gb2312",$_POST["tp"]); unlink($delurl); //刪除檔案 echo "<script>parent.showimg('{$fname}');</script>"; } }}
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