[英]How to generate a random number for each page?
I'm using node.js and express, and I'd like to generate a random five-figure number in app.js and return it to the client. 我正在使用node.js和express,我想在app.js中生成一个随机的五位数字并将其返回给客户端。
I'd like to do this on the server rather than the client, because I want to be certain that the number is different for every user who is currently connected . 我想在服务器而不是客户端上执行此操作,因为我想确定当前连接的每个用户的数量是不同的 。
Here's my current (broken) code from app.js: 这是我在app.js中的当前(损坏)代码:
// My first attempt - a function to generate a random number.
// But this returns the same number to every client.
function genRandNum() {
return Math.floor(Math.random() * 90000) + 10000;
}
// Routes
app.get('/', function(req, res){
res.render('index', {
title: 'Hello world',
random_id: genRandNum() // No good - not different for each user.
});
});
There are actually two problems: 实际上有两个问题:
Thanks for helping out a beginner :) 感谢您帮助初学者:)
Your code works for me, with index.jade: 你的代码适用于我,index.jade:
h1 #{random_id}
However, as written it generates a random # for each page , not just each client. 但是,正如所写,它为每个页面生成一个随机#,而不仅仅是每个客户端。 Some sort of backing data store would be needed to permanently guarantee each client has a unique #, but since you're only using 5-digits (90K possible IDs), you're clearly not concerned with this being unguessable.
需要某种支持数据存储来永久保证每个客户端都有一个唯一的#,但由于你只使用5位数(90K可能的ID),你显然不关心这是不可思议的。 And if you only care about this in the context of a single node process, why not just use an auto incrementing value?
如果您只关注单个节点进程的上下文,为什么不使用自动递增值呢?
var clientId = 1;
app.get('/', function(req, res){
res.render('index', {
title: 'Hello world',
random_id: clientId++
});
});
对于唯一的随机数,您也可以从用户那里获得帮助..他可以输入一些随机的击键然后你可以修改它们/加/减一些东西并在服务器上发送
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