harmony 鸿蒙Console

2025-06-12
浏览 (3)

Console

The console module provides a simple debugging console, which is similar to the JavaScript console provided by the browser.

NOTE

The initial APIs of this module are supported since API version 3. Newly added APIs will be marked with a superscript to indicate their earliest API version.

console.debug

debug(message: string, …arguments: any[]): void

Prints debugging information in formatted output mode.

This API can be used in ArkTS widgets since API version 9.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name	Type	Mandatory	Description
message	string	Yes	Text to be printed.
arguments	any[]	No	Arguments in the message or other information to be printed.

Example

const number = 5;
console.debug('count: %d', number);  // Print the debugging information with arguments in the message replaced.
// count: 5 
console.debug('count:', number);  // Print the message and other information.
// count: 5 
console.debug('count:'); // Print the message only.
// count:

console.log

log(message: string, …arguments: any[]): void

Prints log information in formatted output mode.

This API can be used in ArkTS widgets since API version 9.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name	Type	Mandatory	Description
message	string	Yes	Text to be printed.
arguments	any[]	No	Arguments in the message or other information to be printed.

Example

const number = 5;
console.log('count: %d', number);  // Print the log information with arguments in the message replaced.
// count: 5 
console.log('count:', number);  // Print the message and other information.
// count: 5 
console.log('count:'); // Print the message only.
// count:

console.info

info(message: string, …arguments: any[]): void

Prints log information in formatted output mode. This API is the alias of console.log ().

This API can be used in ArkTS widgets since API version 9.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name	Type	Mandatory	Description
message	string	Yes	Text to be printed.
arguments	any[]	No	Arguments in the message or other information to be printed.

Example

const number = 5;
console.info('count: %d', number);  // Print the log information with arguments in the message replaced.
// count: 5 
console.info('count:', number);  // Print the message and other information.
// count: 5 
console.info('count:'); // Print the message only.
// count:

console.warn

warn(message: string, …arguments: any[]): void

Prints warning information in formatted output mode.

This API can be used in ArkTS widgets since API version 9.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name	Type	Mandatory	Description
message	string	Yes	Warning information to be printed.
arguments	any[]	No	Arguments in the message or other information to be printed.

Example

const str = "name should be string";
console.warn('warn: %d', str); // Print the warning information with arguments in the message replaced.
// warn: name should be string
console.warn('warn:', str);  // Print the message and other information.
// warn: name should be string
console.warn('warn:'); // Print the message only.
// warn:

console.error

error(message: string, …arguments: any[]): void

Prints error information in formatted output mode.

This API can be used in ArkTS widgets since API version 9.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name	Type	Mandatory	Description
message	string	Yes	Error information to be printed.
arguments	any[]	No	Arguments in the message or other information to be printed.

Example

const str = "value is not defined";
console.error('error: %d', str);  // Print the error information with arguments in the message replaced.
// error: value is not defined
console.error('error:', str);  // Print the message and other information.
// error: value is not defined
console.error('error:'); // Print the message only.
// error:

console.assert¹⁰⁺

assert(value?: Object, …arguments: Object[]): void

Prints assertion information.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
value	Object	No	Result value. If value is false or left blank, the output starting with “Assertion failed” is printed. If value is true, no information is printed.
arguments	Object	No	Other information to be printed when value is false. If this parameter is left blank, other information is not printed.

Example

console.assert(true, 'does nothing');  // Do not print error information as value is true.
console.assert(2% 1 == 0,'does nothing');  // Do not print error information as value is true.

console.assert(false, 'console %s work', 'didn\'t');
// Assertion failed: console didn't work

console.assert();
// Assertion failed

console.count¹⁰⁺

count(label?: string): void

Maintains an internal counter. When this counter is invoked, its label name and the corresponding call count are printed.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
label	string	No	Counter label name. The default value is default.

Example

console.count()
// default: 1
console.count('default')
// default: 2
console.count('abc')
// abc: 1
console.count('xyz')
// xyz: 1
console.count('abc')
// abc: 2
console.count()
// default: 3

console.countReset¹⁰⁺

countReset(label?: string): void

Resets a counter based on the specified label name.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
label	string	No	Counter label name. The default value is default.

Example

console.count('abc');
// abc: 1
console.countReset('abc');
console.count('abc');
// abc: 1

console.dir¹⁰⁺

dir(dir?: Object): void

Prints content of the specified object.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
dir	Object	No	Object whose content needs to be printed. If this parameter is left blank, no information is printed.

Example

class bar {
  baz: boolean = true;
}
let b: bar = {baz: true}
class foo{
  bar: bar = b;
}
let c: foo = {bar: b}
class  c1{
  foo: foo = c;
}
let a: c1 = {foo: c}
console.dir(a);
// Object: {"foo":{"bar":{"baz":true}}}

console.dir(); // No information is printed.

console.dirxml¹⁰⁺

dirxml(…arguments: Object[]): void

Displays an interactive tree of the descendant elements of the specified XML element. This API is implemented by calling console.log() internally. It does not produce any XML elements. The usage method is the same as that of console.log().

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
arguments	Object	Yes	Information to be printed.

Example

const number = 5;
console.dirxml('count: %d', number);
// count: 5 
console.dirxml('count:', number);
// count: 5 
console.dirxml('count:');
// count:

console.group¹⁰⁺

group(…arguments: Object[]): void

Increases the indentation of subsequent lines by two spaces. If the information to be printed is provided, the information is printed without extra indentation.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
arguments	Object	No	Information to be printed.

Example

console.log("outter");
// outter
console.group();
console.log("level 1");
//   level 1
console.group("in level1");
//   in level1
console.log("level 2");
//     level 2

console.groupCollapsed¹⁰⁺

groupCollapsed(…arguments: Object[]): void

Creates a new inline group in collapsed mode. The usage and function of this API are the same as those of console.group().

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
arguments	Object	No	Information to be printed.

Example

console.groupCollapsed("outter");
// outter
console.groupCollapsed();
console.log("level 1");
//   level 1
console.groupCollapsed("in level1");
//   in level1
console.log("level 2");
//     level 2

console.groupEnd¹⁰⁺

groupEnd(): void

Reduces the indentation of subsequent lines by two spaces.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Example

console.log("outter");
// outter
console.group();
console.log("level 1");
//   level 1
console.groupEnd();
console.log("outter");
// outter

console.table¹⁰⁺

table(tableData?: Object): void

Prints data in a table.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
tableData	Object	No	Data to be printed in a table. If this parameter is left blank, no information is printed.

Example

console.table([1, 2, 3]);
// ┌─────────┬────────┐
// │ (index) │ Values │
// ├─────────┼────────┤
// │    0    │   1    │
// │    1    │   2    │
// │    2    │   3    │ 
// └─────────┴────────┘

console.table({ a: [1, 2, 3, 4, 5], b: 5, c: { e: 5 } });

// ┌─────────┬───┬───┬───┬───┬───┬───┬────────┐
// │ (index) │ 0 │ 1 │ 2 │ 3 │ 4 │ e │ Values │
// ├─────────┼───┼───┼───┼───┼───┼───┼────────┤
// │    a    │ 1 │ 2 │ 3 │ 4 │ 5 │   │        │
// │    b    │   │   │   │   │   │   │   5    │
// │    c    │   │   │   │   │   │ 5 │        │
// └─────────┴───┴───┴───┴───┴───┴───┴────────┘

console.time¹⁰⁺

time(label?: string): void

Starts a timer to track the duration of an operation. You can use console.timeEnd() to close the timer and print the elapsed time (in ms).

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
label	string	No	Timer label. The default value is default.

Example

console.time('abc');

console.timeEnd¹⁰⁺

timeEnd(label?: string): void

Stops the timer started by calling console.time() and prints the elapsed time (in ms).

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
label	string	No	Timer label. The default value is default.

Example

console.time('abc');
console.timeEnd('abc');
// abc: 225.438ms

console.timeLog¹⁰⁺

timeLog(label?: string, …arguments: Object[]): void

Prints the elapsed time and other data parameters for the timer started by console.time().

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
label	string	No	Timer label. The default value is default.
arguments	Object	No	Logs to be printed.

Example

console.time('timer1');
console.timeLog('timer1', 17);
// timer1: 365.227ms 17
console.timeEnd('timer1');
// timer1: 513.22ms

console.trace¹⁰⁺

static trace(…arguments: Object[]): void

Creates a stack trace.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Parameters

Name	Type	Mandatory	Description
arguments	Object	No	Logs to be printed. If this parameter is left blank, only stack information is printed.

Example

console.trace();
// Trace:
//     xxxxxxxxxx (current stack information)
console.trace("Show the trace");
// Trace: Show the trace
//     xxxxxxxxxx (current stack information)

console.traceHybridStack¹²⁺

static traceHybridStack(): void

Prints information about the current hybrid stack of the calling thread in the main thread or worker thread.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.Utils.Lang

Example

console.traceHybridStack();
// TraceHybridStack:
// xxxxxxxxxxxxx (information about the current hybrid stack of the calling thread)

你可能感兴趣的鸿蒙文章

harmony 鸿蒙Common Capabilities

harmony 鸿蒙_j_s_v_m

harmony 鸿蒙JSVM_CallbackStruct

harmony 鸿蒙JSVM_CreateVMOptions

harmony 鸿蒙JSVM_ExtendedErrorInfo

harmony 鸿蒙JSVM_HeapStatistics

harmony 鸿蒙JSVM_InitOptions

harmony 鸿蒙JSVM_PropertyDescriptor

harmony 鸿蒙JSVM_PropertyHandlerConfigurationStruct

harmony 鸿蒙JSVM_ScriptOrigin

0 赞

所属分类： 后端技术
本文标签：
版权声明： 原创文章如转载，请注明本文链接: https://m.seaxiang.com/blog/G0ZaFC

harmony 鸿蒙Console

Console

console.debug

console.log

console.info

console.warn

console.error

console.assert¹⁰⁺

console.count¹⁰⁺

console.countReset¹⁰⁺

console.dir¹⁰⁺

console.dirxml¹⁰⁺

console.group¹⁰⁺

console.groupCollapsed¹⁰⁺

console.groupEnd¹⁰⁺

console.table¹⁰⁺

console.time¹⁰⁺

console.timeEnd¹⁰⁺

console.timeLog¹⁰⁺

console.trace¹⁰⁺

console.traceHybridStack¹²⁺

你可能感兴趣的鸿蒙文章

热门推荐

标签云

最新文章

本文目录

harmony 鸿蒙Console

Console

console.debug

console.log

console.info

console.warn

console.error

console.assert10+

console.count10+

console.countReset10+

console.dir10+

console.dirxml10+

console.group10+

console.groupCollapsed10+

console.groupEnd10+

console.table10+

console.time10+

console.timeEnd10+

console.timeLog10+

console.trace10+

console.traceHybridStack12+

你可能感兴趣的鸿蒙文章

热门推荐

标签云

最新文章

本文目录

console.assert¹⁰⁺

console.count¹⁰⁺

console.countReset¹⁰⁺

console.dir¹⁰⁺

console.dirxml¹⁰⁺

console.group¹⁰⁺

console.groupCollapsed¹⁰⁺

console.groupEnd¹⁰⁺

console.table¹⁰⁺

console.time¹⁰⁺

console.timeEnd¹⁰⁺

console.timeLog¹⁰⁺

console.trace¹⁰⁺

console.traceHybridStack¹²⁺