javascript - 我需要在 Chrome 中上传一个文件，并且需要在同一个请求中**发布**一些参数

Question

我需要在 Chrome 中上传一个文件，并且需要在同一请求中发布一些参数，并且需要基本身份验证。我想使用 javascript AJAX 来做到这一点。但是 chrome 不支持 sendAsBinary，我该怎么做？

function sendMsg(status){

    var user = localStorage.getObject(CURRENT_USER_KEY);
    var file = $("#imageFile")[0].files[0];

    var boundary = '----multipartformboundary' + (new Date).getTime();
    var dashdash = '--';
    var crlf     = '\r\n';

    /* Build RFC2388 string. */
    var builder = '';

    builder += dashdash;
    builder += boundary;
    builder += crlf;

    var xhr = new XMLHttpRequest();
    var upload = xhr.upload;
    xhr.onreadystatechange = function(){
        if(xhr.readyState==4){
            //
        }
    };

　　if(upload){
        upload.onprogress = function(ev){
            onprogress(ev);
        };
    }

    /* Generate headers. [STATUS] */            
    builder += 'Content-Disposition: form-data; name="status"';
    builder += crlf;
    builder += crlf; 

    /* Append form data. */
    builder += msg;
    builder += crlf;

    /* Write boundary. */
    builder += dashdash;
    builder += boundary;
    builder += crlf;

    /* Generate headers. [PIC] */            
    builder += 'Content-Disposition: form-data; name="pic"';
    if (file.fileName) {
      builder += '; filename="' + file.fileName + '"';
    }
    builder += crlf;

    builder += 'Content-Type: '+file.type;
    builder += crlf;
    builder += crlf; 

    /* Append binary data. */
    builder += file.getAsBinary(); //chrome do not support getAsBinary()
    builder += crlf;

    /* Write boundary. */
    builder += dashdash;
    builder += boundary;
    builder += crlf;

    /* Mark end of the request. */
    builder += dashdash;
    builder += boundary;
    builder += dashdash;
    builder += crlf;

    xhr.open("POST", apiUrl.sina.upload, true);
    xhr.setRequestHeader('content-type', 'multipart/form-data; boundary=' + boundary);
    xhr.setRequestHeader('Authorization', make_base_auth_header(user.userName, user.password));
    xhr.sendAsBinary(builder); //chrome do not support sendAsBinary()

    xhr.onload = function(event) { 
        /* If we got an error display it. */
        if (xhr.responseText) {
            console.log(xhr.responseText);
        }
    };
};

Answer 1

使用xhr.send(FormData)。您不需要自己构造 multipart-form-data :)在这里查看我的回复:

Javascript/HTML5 file API reading sequential files into multipart form data