Assign console.log value to a variable

问题

How can I assign a JavaScript object to a variable which was printed using console.log?

I am in Chrome console. With Ruby I would use test = _ to access the most recent item printed.

回答1:

You could override standard console.log() function with your own, adding the behaviour you need:

console.oldLog = console.log;

console.log = function(value)
{
    console.oldLog(value);
    window.$log = value;
};

// Usage

console.log('hello');

$log // Has 'hello' in it

This way, you don't have to change your existing logging code. You could also extend it adding an array and storing the whole history of printed objects/values.

回答2:

If you want to do this to an object that has been already logged (one time thing), chrome console offers a good solution.

Hover over the printed object in the console, right click, then click on "Store as Global Variable". Chrome will assign it to a temporary var name for you which you can use in the console.

回答3:

In Chrome developer tools, you may access last item by $_:

> 1+1;
  2
> $_
  2

回答4:

Derivative of mirrormx's answer, but more convenient. I don't need to write a function and can just put it in anywhere on the spur of the moment.

console.log(window.$log = data);

回答5:

Here is chrome reference for comand line api. There is $_ variable but it "Returns the value of the most recently evaluated expression" not printed, you can make your own log function like this:

function log(data){
   console.log(data);
   return data;
}
// after that you can access last printed value by $_

Please, note that my function is for example, console.log possibilities is much more advanced

来源：https://stackoverflow.com/questions/15462122/assign-console-log-value-to-a-variable

标签

javascript

console.log