一、FormData方式
- 前台代码（注意，不需要用到form标签）：
a. html部分：
b. js部分：
c. 完整代码：
<input type="file" multiple id="lee_file">
<input type="text" id="lee_text" value="test">
<input type="button" value="Upload" id="lee_button">
<script>
function loadDoc(file,data,async=true){
if(window.XMLHttpRequest){ // code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}else{ // code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
if(async === true){
xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState < 4){
// 加载中
}else if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
// 成功
xmlDoc=xmlhttp.responseText;
return xmlDoc
}else{
// 失败
xmlhttp.abort()
return
}
}
}
xmlhttp.open("POST",file,async);
xmlhttp.send(data);
if(async === false){
xmlDoc=xmlhttp.responseText;
return xmlDoc
}
}
function getEle(id){
var ele = document.getElementById(id)
return ele
}
function sendFile() {
var lee_file = getEle('lee_file');
var lee_text = getEle('lee_text');
var form_data = new FormData();
for (var i in lee_file.files) {
form_data.append('pics[]', lee_file.files[i]);
}
form_data.append('text', lee_text.value);
loadDoc('test.php',form_data)
}
var lee_button = getEle('lee_button');
lee_button.onclick = function(){
sendFile()
}
</script>
- php获取（用 $_FILE 获取）：
完整代码：
<?php
header('Access-Control-Allow-Origin: *');
var_dump($_POST);
var_dump($_FILES);
二、FileReader+FormData+base64
- 前台代码：
a. html代码：
b. js代码：
c. 完整代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title></head>
<body>
<form>
<input type="file" multiple id="lee_file">
<input type="button" value="上传图片" id="lee_button">
<img src="" alt="" id="lee_img">
</form>
<script>
function loadDoc(file,data,async=true){
if(window.XMLHttpRequest){ // code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}else{ // code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
if(async === true){
xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState < 4){
// 加载中
}else if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
// 成功
xmlDoc=xmlhttp.responseText;
return xmlDoc
}else{
// 失败
xmlhttp.abort()
return
}
}
}
xmlhttp.open("POST",file,async);
xmlhttp.send(data);
if(async === false){
xmlDoc=xmlhttp.responseText;
return xmlDoc
}
}
function getEle(id){
var ele = document.getElementById(id)
return ele
}
lee_button = getEle('lee_button')
function sendFile() {
var lee_file = getEle('lee_file').files;
var lee_text = getEle('lee_text');
for (var i = 0; i < lee_file.length; i++) {
file = lee_file[i];
var form_data = new FormData();
var reader = new FileReader();
reader.readAsDataURL(file);
reader.onloadend = function() { // onload代表文件读取成功
getEle('lee_img').setAttribute('src',reader.result);
form_data.append('pic', reader.result);
loadDoc('test.php',form_data)
}
}
}
lee_button.onclick = function() {
sendFile();
}
</script>
</body>
</html>
- php代码（用 $_POST 获取）：
a. 允许跨域：
b. 将前台post过来的数据保存为临时文件：
c. 获取文件真实后缀函数：
d. 将临时文件保存为带真实后缀的文件：
e. 完整代码：
<?php
header('Access-Control-Allow-Origin:*');
/*
* 将流文件保存为临时文件
* @param stream base64输入流
* @param tmpname 临时文件路径
*/
function uploadBase64($stream) {
if (empty($stream)) return false;
if (preg_match('/^(data:(\s)?(image|img)\/(\w+);base64,)/', $stream, $str)) {
$suffix = "tmp";
$tmpname = rand(1000, 9999) . ".{$suffix}";
if (file_put_contents($tmpname, base64_decode(str_replace($str[1], '', $stream)))) {
return $tmpname;
} else {
return false;
}
} else {
return false;
}
}
/*
获取图片真实后缀
@param filename 文件名
@param suffix 文件真实后缀（.jpg .png .gif）
*/
function getSuffix($fileName) {
$file = fopen($fileName, "rb");
$bin = fread($file, 2); // 只读2字节
fclose($file);
$strInfo = @unpack("C2chars", $bin);
$typeCode = intval($strInfo['chars1'] . $strInfo['chars2']);
$suffix = "unknow";
if($typeCode == 255216){
$suffix = "jpg";
}elseif($typeCode == 7173){
$suffix = "gif";
}elseif($typeCode == 13780){
$suffix = "png";
}elseif($typeCode == 6677){
$suffix = "bmp";
}elseif($typeCode == 7798){
$suffix = "exe";
}elseif($typeCode == 7784){
$suffix = "midi";
}elseif($typeCode == 8297){
$suffix = "rar";
}elseif($typeCode == 7368){
$suffix = "mp3";
}elseif($typeCode == 0){
$suffix = "mp4";
}elseif($typeCode == 8273){
$suffix = "wav";
}
return $suffix;
}
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