1.7 KiB
console
Browser-like object for printing to stdout and stderr.
console.log()
Prints to stdout with newline. This function can take multiple arguments in a
printf()-like way. Example:
console.log('count: %d', count);
The first argument is a string that contains zero or more placeholders. Each placeholder is replaced with the converted value from its corresponding argument. Supported placeholders are:
%s- String.%d- Number (both integer and float).%j- JSON.
If the placeholder does not have a corresponding argument, undefined is used.
console.log('%s:%s', 'foo'); // 'foo:undefined'
If there are more arguments than placeholders, the extra arguments are
converted to strings with util.inspect() and these strings are concatenated,
delimited by a space.
console.log('%s:%s', 'foo', 'bar', 'baz'); // 'foo:bar baz'
If the first argument is not a format string then console.log() prints
a string that is the concatenation of all its arguments separated by spaces.
Each argument is converted to a string with util.inspect().
console.log(1, 2, 3); // '1 2 3'
console.info()
Same as console.log.
console.warn()
console.error()
Same as console.log but prints to stderr.
console.dir(obj)
Uses util.inspect on obj and prints resulting string to stderr.
console.time(label)
Mark a time.
console.timeEnd(label)
Finish timer, record output. Example
console.time('100-elements');
for (var i = 0; i < 100; i++) {
;
}
console.timeEnd('100-elements');
console.trace()
Print a stack trace to stderr of the current position.
console.assert()
Same as assert.ok().