什么是console.log？ [英] What is console.log?

问题描述

console.log 有什么用？

请通过代码示例解释如何在JavaScript中使用它。

Please explain how to use it in JavaScript, with a code example.

推荐答案

这不是jQuery功能，而是用于调试目的的功能。例如，当事情发生时，您可以将某些内容记录到控制台。例如：

It's not a jQuery feature but a feature for debugging purposes. You can for instance log something to the console when something happens. For instance:

$('#someButton').click(function() {
  console.log('#someButton was clicked');
  // do something
});

然后你会看到点击#someButton 当您点击按钮时，在Firebug的控制台选项卡（或其他工具的控制台 - 例如Chrome的Web Inspector）中。

You'd then see #someButton was clicked in Firebug’s "Console" tab (or another tool’s console — e.g. Chrome’s Web Inspector) when you would click the button.

由于某些原因，控制台对象可能不可用。然后你可以检查它是否 - 这很有用，因为你在部署到生产时不必删除你的调试代码：

For some reasons, the console object could be unavailable. Then you could check if it is - this is useful as you don't have to remove your debugging code when you deploy to production:

if (window.console && window.console.log) {
  // console is available
}

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