纯JavaScript发送没有表格的数据
有没有办法发送数据使用post方法没有窗体，没有刷新页面只使用纯JavaScript（而不是jQuery $.post() ）？ 也许httprequest或其他东西，只是现在找不到它。
您可以使用XMLHttpRequest对象，如下所示：
xhr.open("POST", url, true); xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); xhr.send(someStuff);
该代码会将someStuff发布到url 。 只要确保在创buildXMLHttpRequest对象时，它将是跨浏览器兼容的。 那里有无数的例子。
您可以发送它并将数据插入正文：
var xhr = new XMLHttpRequest(); xhr.open("POST", yourUrl, true); xhr.setRequestHeader('Content-Type', 'application/json'); xhr.send(JSON.stringify({ value: value }));
顺便说一句，获取请求：
var xhr = new XMLHttpRequest(); // we defined the xhr xhr.onreadystatechange = function () { if (this.readyState != 4) return; if (this.status == 200) { var data = JSON.parse(this.responseText); // we get the returned data } // end of state change: it can be after some time (async) }; xhr.open('GET', yourUrl, true); xhr.send();
而且，RESTful可以让你从POST请求中获取数据。
JS（把静态/ hello.html通过Python提供）：
<html><head><meta charset="utf-8"/></head><body> Hello. <script> var xhr = new XMLHttpRequest(); xhr.open("POST", "/postman", true); xhr.setRequestHeader('Content-Type', 'application/json'); xhr.send(JSON.stringify({ value: 'value' })); xhr.onload = function() { console.log("HELLO") console.log(this.responseText); var data = JSON.parse(this.responseText); console.log(data); } </script></body></html>
Python服务器（用于testing）：
import time, threading, socket, SocketServer, BaseHTTPServer import os, traceback, sys, json log_lock = threading.Lock() log_next_thread_id = 0 # Local log functiondef def Log(module, msg): with log_lock: thread = threading.current_thread().__name__ msg = "%s %s: %s" % (module, thread, msg) sys.stderr.write(msg + '\n') def Log_Traceback(): t = traceback.format_exc().strip('\n').split('\n') if ', in ' in t[-3]: t[-3] = t[-3].replace(', in','\n***\n*** In') + '(...):' t[-2] += '\n***' err = '\n*** '.join(t[-3:]).replace('"','').replace(' File ', '') err = err.replace(', line',':') Log("Traceback", '\n'.join(t[:-3]) + '\n\n\n***\n*** ' + err + '\n***\n\n') os._exit(4) def Set_Thread_Label(s): global log_next_thread_id with log_lock: threading.current_thread().__name__ = "%d%s" \ % (log_next_thread_id, s) log_next_thread_id += 1 class Handler(BaseHTTPServer.BaseHTTPRequestHandler): def do_GET(self): Set_Thread_Label(self.path + "[get]") try: Log("HTTP", "PATH='%s'" % self.path) with open('static' + self.path) as f: data = f.read() Log("Static", "DATA='%s'" % data) self.send_response(200) self.send_header("Content-type", "text/html") self.end_headers() self.wfile.write(data) except: Log_Traceback() def do_POST(self): Set_Thread_Label(self.path + "[post]") try: length = int(self.headers.getheader('content-length')) req = self.rfile.read(length) Log("HTTP", "PATH='%s'" % self.path) Log("URL", "request data = %s" % req) req = json.loads(req) response = {'req': req} response = json.dumps(response) Log("URL", "response data = %s" % response) self.send_response(200) self.send_header("Content-type", "application/json") self.send_header("content-length", str(len(response))) self.end_headers() self.wfile.write(response) except: Log_Traceback() # Create ONE socket. addr = ('', 8000) sock = socket.socket (socket.AF_INET, socket.SOCK_STREAM) sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind(addr) sock.listen(5) # Launch 100 listener threads. class Thread(threading.Thread): def __init__(self, i): threading.Thread.__init__(self) self.i = i self.daemon = True self.start() def run(self): httpd = BaseHTTPServer.HTTPServer(addr, Handler, False) # Prevent the HTTP server from re-binding every handler. # https://stackoverflow.com/questions/46210672/ httpd.socket = sock httpd.server_bind = self.server_close = lambda self: None httpd.serve_forever() [Thread(i) for i in range(10)] time.sleep(9e9)
控制台日志（chrome）：
HELLO hello.html:14 {"req": {"value": "value"}} hello.html:16 {req: {…}} req : {value: "value"} __proto__ : Object
控制台日志（firefox）：
GET http://XXXXX:8000/hello.html [HTTP/1.0 200 OK 0ms] POST XHR http://XXXXX:8000/postman [HTTP/1.0 200 OK 0ms] HELLO hello.html:13:3 {"req": {"value": "value"}} hello.html:14:3 Object { req: Object }
控制台日志（Edge）：
HTML1300: Navigation occurred. hello.html HTML1527: DOCTYPE expected. Consider adding a valid HTML5 doctype: "<!DOCTYPE html>". hello.html (1,1) Current window: XXXXX/hello.html HELLO hello.html (13,3) {"req": {"value": "value"}} hello.html (14,3) [object Object] hello.html (16,3) { [functions]: , __proto__: { }, req: { [functions]: , __proto__: { }, value: "value" } }
Python日志：
HTTP 8/postman[post]: PATH='/postman' URL 8/postman[post]: request data = {"value":"value"} URL 8/postman[post]: response data = {"req": {"value": "value"}}
在2017年写作的时候， 提取API是为了使GET请求变得简单，但它也能够进行POST。
let data = {element: "barium"}; fetch("/post/data/here", { method: "POST", body: JSON.stringify(data) }).then(res => { console.log("Request complete! response:", res); });
如果你像我一样懒（或只是喜欢一个快捷方式/帮手）：
window.post = function(url, data) { return fetch(url, {method: "POST", body: JSON.stringify(data)}); } // ... post("post/data/here", {element: "osmium"});
