hi在我的应用程序中,如果用户关闭选项卡/窗口,我想将其注销。为此,我以下列方式使用navigator.sendBeacon
:
client.js
:
window.addEventListener('unload', logData, false);
function logData() {
var b = localStorage.localStor;
if (b != null && b != "{}") {
console.log("closed");
console.log(JSON.parse(b).email); //prints user email
navigator.sendBeacon("/log", { email: JSON.parse(b).email });
localStorage.clear();
}
}
server.js
:( node.js)
var http = require('http');
var url = require('url');
var fs = require('fs');
var server = http.createServer(function (request, response) {
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS, DELETE");
var url_parts = url.parse(request.url);
var path = url_parts.path;
var postBody = []; //for post uses
if (path === "/log") {
console.log("looging out"); // doesn't appear in node.js commad line
postBody = [];
request.on('data', (chunk) => {
postBody.push(chunk);
}).on('end', () => {
postBody = Buffer.concat(postBody).toString();
var parsedData = JSON.parse(postBody);
var emailIndex = usersList.findIndex(function (element) {
return element.email === parsedData.email;
});
console.log("length before :" + usersList.length); //nothing appear
usersList.splice(emailIndex, 1);
console.log("length before :" + usersList.length); //nothing appear
});
}
在应用程序中,我每隔30秒使用settimeout
显示usersList
长度的当前连接用户数,但关闭窗口时,localStorage确实清晰但用户仍然连接,因为连接用户数量不会改变。很明显,sendBeacon不会以某种方式进入服务器,但它不会应用条件if (path === "/log")
。关闭选项卡后,我在termenal中得到以下错误(我在Visual Code中工作):
" POST / log"错误(404):"未找到"
我搜索了如何使用sendbeacon,我在here中使用了它,但我认为由于我得到错误,请求不会发送到服务器。
知道如何解决这个问题吗?
提前致谢!
答案 0 :(得分:1)
每件事情都是对的,但sendBeacon应该是这样的:
navigator.sendBeacon("http://localhost:8080/log", { email: JSON.parse(b).email });