問題描述

我正在嘗試將 base64 編碼的 img 發(fā)送到服務(wù)器，javascript 看起來像

I am trying to to send a base64 encoded img to server,the javascript looks like

var xhr=new XMLHttpRequest()
var reader=new FileReader()
reader.onloadend=function(e){
xhr.onload=function(e){
alert(xhr.responseText)
}
xhr.open("POST","upload.php");
        xhr.setRequestHeader("Cache-Control", "no-cache");
        xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
        //xhr.setRequestHeader("X-File-Name", file.name);
        //xhr.setRequestHeader("X-File-Type",file.type)
xhr.send(e.target.result)
}
reader.readAsDataURL(file)
},false)

在 php 中，如下所示:

In php,looks like this:

echo "some response Text";
$postdata = file_get_contents("php://input");
file_put_contents('MyFile.jpg', base64_decode($postdata));

最后，服務(wù)器得到一個(gè)文件正好與發(fā)送的文件一樣大，但是無法打開
有人有一些想法嗎?非常感謝！

And,eventually,the server gets a file exactly as big as the sent file,However,it can't be opened
Some one get some ideas?Thanks a lot!

推薦答案

reader.readAsDataURL(file)

數(shù)據(jù) URL 與文件的 base64 版本不同.你會(huì)得到額外的垃圾.它看起來像這樣:

A data URL is NOT the same as a base64 version of the file. You get extra garbage in it. It looks like this:

data:[<MIME-type>][;charset=<encoding>][;base64],<data>

參見維基百科.

嘗試對(duì)其做一個(gè)簡單的正則表達(dá)式:

Try doing a simple regex on it:

var data = dataURL.match(/,(.*)$/)[1];

或者，在您的代碼中，

xhr.send(e.target.result.match(/,(.*)$/)[1]);

這篇關(guān)于xhr 發(fā)送 base64 字符串并在服務(wù)器中將其解碼為文件的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！