how can I use console.error or console.log in a vue template?

问题

I have a vue component with

 <form @keydown="console.error($event.target.name);">

gives

app.js:47961 [Vue warn]: Property or method "console" is not defined on the instance but referenced during render.

window.console doesnt work either

what is the proper way to use console and window in a template to debug?

回答1:

If you want to run it inline instead of using a method, just add this to the form:

Codepen: https://codepen.io/x84733/pen/PaxKLQ?editors=1011

<form action="/" @keydown="this.console.log($event.target.name)">
  First: <input type="text" name="fname"><br>
  Second: <input type="text" name="fname2"><br>
</form>

But it'd be better to use a method instead of running functions inline, so you have more control over it:

<!-- Don't forget to remove the parenthesis -->
<form action="/" @keydown="debug">
  First: <input type="text" name="fname"><br>
  Second: <input type="text" name="fname2"><br>
</form>

...

methods: {
  debug (event) {
    console.log(event.target.name)
  }
}

回答2:

Simplest way of providing global objects to the template is to place them in computed, like this:

console: () => console. Same goes for window,

computed: {
  console: () => console,
  window: () => window,
}

See it here.

回答3:

I'd make a getter for console template variable:

    get console() { return window.console; }

回答4:

You can use this.console instead console or wrap call to console in a method, i am using eslint config with rule 'no-console': 'off'

来源：https://stackoverflow.com/questions/51080447/how-can-i-use-console-error-or-console-log-in-a-vue-template

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