javascript - JavaScript：如何将消息打印到错误控制台？(JavaScript: How do I print a message to the error console?)

Question

How can I print a message to the error console, preferably including a variable?(如何将消息打印到错误控制台，最好包括变量？)

For example, something like:(例如，类似于：) print('x=%d', x);   ask by Mark Harrison translate from so