我想在服务器和客户端之间传递json对象。服务器端看起来像这样:eventListener按钮在HTML客户端和node.js服务器之间交换数据
var express = require('express'); // Express web server framework
var request = require('request'); // "Request" library
var querystring = require('querystring');
var cookieParser = require('cookie-parser');
var bodyParser = require("body-parser");
var app = express();
app.use(express.static("public"));
app.engine('html', require('ejs').renderFile);
app.set('view engine', 'html');
app.post("/", function (req, res) {
console.log('Request received');
var return_value;
req.on('data', function (chunk) {
console.log('GOT DATA!');
json = JSON.parse(chunk);
json.access_date = "12.04.17";
return_value = JSON.stringify(chunk);
});
res.writeHead(200, {
'Content-Type': 'application/json;charset=UTF-8',
'Access-Control-Allow-Origin': '*'
});
res.json(return_value);
})
var server = app.listen("8080")
console.log('Server running port 8080/');
附加到按钮上的以下功能。
<script type="text/javascript">
document.getElementById("myBtn").addEventListener("click", passArg);
function passArg() {
console.log("I'm here")
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("POST", "/", true);
xmlhttp.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == XMLHttpRequest.DONE) {
if (xmlhttp.status == 200) {
//var json = JSON.parse(xmlhttp.responseText);
console.log("Data passed back: " + xmlhttp.responseText)
}
else if (xmlhttp.status == 400) {
alert('There was an error 400');
}
else {
alert('something else other than 200 was returned');
}
}
}
var data = JSON.stringify({"email":"[email protected]","password":"101010"});
xmlhttp.send(data);
}
</script>
现在,在点击控制台日志“我在这里”触发罚款,但该函数返回代码的POST部分404错误。我也不完全了解如何将数据从服务器传回客户端。方法res.end()
是否是正确的方法?
编辑:我编辑脚本以反映答案。
谢谢,这工作出色。但是,我仍然坚持如何将对象发送回客户端。如果你能阐明一点,我会非常感激。 – Copperwire