Javascript XHR 发送多部分/表单数据
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Javascript XHR send multipart/form-data
提问by php_nub_qq
I'm trying to send a multipart/form-data content-type request:
我正在尝试发送多部分/表单数据内容类型请求：
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(){
if(xhr.readyState==4){
alert(xhr.responseText);
}
}
xhr.open("POST", url, true);
xhr.setRequestHeader("Content-Type","multipart/form-data; boundary=---------------------------275932272513031");
xhr.send('-----------------------------275932272513031 Content-Disposition: form-data; name="name"
test
----------------------------275932272513031--');
Then in php I just print the $_POSTarray
然后在php中我只打印$_POST数组
print_r($_POST);
But I get an empty array each time. I expect to see
但我每次都会得到一个空数组。我期待看到
Array (
name => "test"
)
What am I doing wrong?
我究竟做错了什么？
回答by Rob W
Your code failed because you've used "Enter" instead of an escaped line break character (\n).
JavaScript doesn't support "first line[Enter]second line". If you need a string with a line break, use "first line\nsecond line".
您的代码失败，因为您使用了“Enter”而不是转义的换行符 ( \n)。
JavaScript 不支持"first line[Enter]second line". 如果您需要带换行符的字符串，请使用"first line\nsecond line".
Once you've fixed this problem, your code should work as intended (with one caveat, see final note):
一旦你解决了这个问题，你的代码应该可以按预期工作（有一个警告，请参阅最后的注释）：
var xhr = new XMLHttpRequest();
xhr.onload = function() {
alert(xhr.responseText);
};
xhr.open("POST", url, true);
xhr.setRequestHeader("Content-Type","multipart/form-data; boundary=---------------------------275932272513031");
xhr.send('-----------------------------275932272513031\n' +
'Content-Disposition: form-data; name="name"\n\n' +
'test\n\n' +
'----------------------------275932272513031--');
NOTE: Your code will only work for payloads that consists of UTF-8 characters, notbinary data. If you want to learn more about submitting forms with binary data via XMLHttpRequest, see this answerand its linked references.
注意：您的代码仅适用于由 UTF-8 字符组成的有效负载，而不适用于二进制数据。如果您想了解有关通过 XMLHttpRequest 提交带有二进制数据的表单的更多信息，请参阅此答案及其链接的参考资料。
