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php+js實(shí)現(xiàn)異步圖片上傳實(shí)例分享

更新時(shí)間：2014年06月02日 14:49:19 作者：

本來(lái)想用插件上傳圖片的，后來(lái)自己寫了一個(gè)簡(jiǎn)單的js實(shí)現(xiàn)異步的圖片上傳，不多說(shuō)上代碼非常簡(jiǎn)單

upload.php

<?php
if(isset($_FILES["myfile"]))
{
$ret = array();
$uploadDir = 'images'.DIRECTORY_SEPARATOR.date("Ymd").DIRECTORY_SEPARATOR;
$dir = dirname(__FILE__).DIRECTORY_SEPARATOR.$uploadDir;
file_exists($dir) || (mkdir($dir,0777,true) && chmod($dir,0777));
if(!is_array($_FILES["myfile"]["name"])) //single file
{
$fileName = time().uniqid().'.'.pathinfo($_FILES["myfile"]["name"])['extension'];
move_uploaded_file($_FILES["myfile"]["tmp_name"],$dir.$fileName);
$ret['file'] = DIRECTORY_SEPARATOR.$uploadDir.$fileName;
}
echo json_encode($ret);
}

?>

index.html

復(fù)制代碼代碼如下:

<!DOCTYPE html>
<html>
<head>
<title>Html5 Ajax 上傳文件</title>
<meta charset="utf-8">

    var xhr;
    function createXMLHttpRequest()
    {
        if(window.ActiveXObject)
        {
            xhr = new ActiveXObject("Microsoft.XMLHTTP");
        }
        else if(window.XMLHttpRequest)
        {
            xhr = new XMLHttpRequest();
        }
    }

    function UpladFile()
    {
        var fileObj = document.getElementById("file").files[0];
        var FileController = 'upload.php';
        var form = new FormData();
        form.append("myfile", fileObj);
        createXMLHttpRequest();
        xhr.onreadystatechange = handleStateChange;
        xhr.open("post", FileController, true);
        xhr.send(form);
    }