如何使用回调衡量JavaScript代码的执行时间? [英] How do I measure the execution time of JavaScript code with callbacks?

问题描述

我有一段使用node.js解释器执行的JavaScript代码.

I have a piece of JavaScript code that I am executing using the node.js interpreter.

for(var i = 1; i < LIMIT; i++) {
  var user = {
    id: i,
    name: "MongoUser [" + i + "]"
  };
  db.users.save(user, function(err, saved) {
    if(err || !saved) {
      console.log("Error");
    } else {
      console.log("Saved");
    }
  });
}

如何测量这些数据库插入操作所花费的时间?我可以计算这段代码前后的日期值之差，但是由于代码的异步特性，这将是不正确的.

How can I measure the time taken by these database insert operations? I could compute the difference of date values after and before this piece of code but that would be incorrect because of the asynchronous nature of the code.

推荐答案

使用Node.js console.time() 和 console.timeEnd() :

Use the Node.js console.time() and console.timeEnd():

var i;
console.time("dbsave");

for(i = 1; i < LIMIT; i++){
    db.users.save({id : i, name : "MongoUser [" + i + "]"}, end);
}

end = function(err, saved) {
    console.log(( err || !saved )?"Error":"Saved");
    if(--i === 1){console.timeEnd("dbsave");}
};

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