node.js - node 回调函数中 var temp = this 的意义

Answer 1

See notes:

this is req, which is a streamthis is req, which is a stream

此时this指向req，而req对外可以当做是stream

At this time, this points to req, and req can be used as stream externally, just changing the name , it seems clearer, it has no special meaning. 🎜

Answer 2

I can only say that this demo is poorly written, and there is no need to be superstitious and overly speculate on its intentions.

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Normal similar writing is like this

var xx = function() {
    var that = this;
    
    return funtion() {
        that.xxx
    }
}

You can reference this in the upper scope in the closure