ste*_*eke 20 javascript node.js
我用Node.js运行一个简单的http服务器:
var http = require('http');
var fs = require('fs');
var index = fs.readFileSync('index.html');
var sensor = require('ds18x20');
var temp = sensor.get('sensorID');
http.createServer(function(req,res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end(index);
}).listen(80);
console.log(temp);
我的index.html文件:
<html>
<head>
</head>
<body>
My temperature:
//space for variable: temp
</body>
</html>
现在,我想在index.html文件中打印服务器端变量:temp.但我不知道该怎么做.
也许有人可以帮助我从服务器到客户端交换变量.
Ole*_*leg 27
正如您在@WebServer的答案中所读到的那样,节点中有各种模板引擎.
我想举一个使用其中一个的例子 - EJS:
首先安装它:
npm install ejs
server.js:
var http = require('http');
var ejs = require('ejs');
var fs = require('fs');
http.createServer(function(req,res) {
res.writeHead(200, {'Content-Type': 'text/html'});
//since we are in a request handler function
//we're using readFile instead of readFileSync
fs.readFile('index.html', 'utf-8', function(err, content) {
if (err) {
res.end('error occurred');
return;
}
var temp = 'some temp'; //here you assign temp variable with needed value
var renderedHtml = ejs.render(content, {temp: temp}); //get redered HTML code
res.end(renderedHtml);
});
}).listen(80);
您的视图可能如下所示:
<html>
<head>
</head>
<body>
My temperature: <%= temp %>
</body>
</html>
EJS也会temp为您逃脱(以及您传递给视图的其他变量),因此您不必担心XSS攻击.
编辑
如果您不想在每个请求上读取文件,也可以编译模板:
var http = require('http');
var ejs = require('ejs');
var fs = require('fs');
//we are not in a request handler so we may use readFileSync
var content = fs.readFileSync('index.html', 'utf-8');
var compiled = ejs.compile(content);
http.createServer(function(req,res) {
var temp = 'some temp';
res.writeHead(200, {'Content-Type': 'text/html'});
res.end(compiled({temp: temp}));
}).listen(80);
编辑2(回答你的评论问题)
以下是使用Express和AJAX的简单示例:
server.js:
var http = require('http');
var express = require('express');
var app = express();
app.configure(function() {
app.set('view engine', 'ejs'); //tell Express we're using EJS
app.set('views', __dirname + '/views'); //set path to *.ejs files
app.use(app.router);
//put your static files (js, css, images) into /public directory
app.use('/public', express.static(__dirname + '/public'));
});
//get some server data for sending it to the client
var getData = function() {
return Math.random().toString();
}
app.get('/', function(req, res) {
//render index.ejs file
res.render('index', {val: getData()});
});
app.get('/ajax', function(req, res) {
res.send(getData());
});
http.createServer(app).listen(80);
意见/ index.ejs:
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script src="/public/js/request.js"></script>
</head>
<body>
<h1>Val: <span id="val"><%=val%></span></h1>
<button id="loadRequest">Refresh</button>
</body>
</html>
公共/ JS/request.js:
$(function() {
$('#loadRequest').click(function() {
$.get('/ajax', function(res) {
$('#val').text(res);
});
});
});
希望这可以帮助