app.locals在Express.js中未定义

Question

我在server.js中设置app.locals，这是我的代码

queryParamsDidChange

但是当我从另一个文件调用相同的内容时，app.locals将以未定义的形式出现。

 //server.js
 app.locals.abi=abi;
 app.locals.SampleContract=SampleContract;
 app.locals.web3=web3;

Answer 1

使用req.app.locals而不是req.locals

Answer 2

设置为键值对

app.set('abi',abi);
app.set('SampleContract',SampleContract);
app.set('web3',web3);

使用密钥

function getDetails(req,res,next){
    contract=req.app.get('SampleContract');
    web3=req.locals.web3;
    contractAddress=req.locals.contractAddress;
    next();
}