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上傳檔案到php後臺全過程

前端程式碼:

<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8" />
	<title>Document</title>
	<script type="text/javascript" src="app/jquery-1.9.0.min.js" ></script>
</head>
<body>
	<form enctype="multipart/form-data" method="post" name="fileinfo" id="fileinfo">
  	<input type="file" name="myfile" />
	</form>
<button onclick='send()'>click</button>
<script>
	function send(){
	var fd = new FormData(document.getElementById("fileinfo"));
//userName不在表單中
//fd.append("userName", "xiaoxiao");
$.ajax({
url: "http://localhost/test.php",
type: "POST",
data: fd,
processData: false,  // 告訴jQuery不要去處理髮送的資料
contentType: false,   // 告訴jQuery不要去設定Content-Type請求頭
success:function(data,state){
	console.log(data)
}
});	
	}
	
</script>
</body>
</html>
php程式碼:
<?php 
header('Access-Control-Allow-Origin:*'); 
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");
 if(is_uploaded_file($_FILES['myfile']['tmp_name'])){
	$root_dir ="upload_path/";
	$filename =  $_FILES['myfile']['name'];
	$uploadfile = $root_dir . $filename;
	if (move_uploaded_file($_FILES['myfile']['tmp_name'], $uploadfile)) {
		//上傳success
     		echo "uploaded success";
	}  
}
?>

<?php   
header('Access-Control-Allow-Origin:*');   
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");  
 if(is_uploaded_file($_FILES['file']['tmp_name'])){  
    $root_dir ="upload_path/";  
    $filename =  $_FILES['file']['name'];
    $filename =  time() . $filename;
    $uploadfile = $root_dir . $filename;  

    if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadfile)) {  
        //上傳success  
            echo '{"pic":"'. $uploadfile .'"}';  
    }    
}  
?>