Node.js console.groupCollapsed() 方法

console.groupCollapsed() 方法内置于控制台模块中，用于折叠分组内容，直到调用 console.groupEnd() 方法。它启动折叠组，可以使用 groupEnd() 方法结束。

句法：

console.groupCollapsed([label]);

参数：此方法只接受一个参数，如上所述，如下所述：

标签：您在控制台上分组的组的标签。这是一个可选参数。

返回值：它不返回任何值。

下面的示例说明了在 Node.js 中使用console.groupCollapsed()方法。

示例 1：

文件名：index.js

Javascript

// Node.js program to demonstrate the
// console.groupCollapsed() method
// This code example demonstrate the
// method without parameter
 
// Accessing console module
const console = require('console');
 
console.log("GeeksforGeeks (Outside)")
console.log();
 
// Creating first group calling
// console.groupCollapsed() method
console.groupCollapsed();
 
// Printing First line of Group
console.log("GeeksforGeeks (1)");
 
// Printing Second line of Group
console.log("GeeksforGeeks (2)");
 
// End the group (It is used to end the
// group for more understanding the
// group method)
console.groupEnd();
console.log();

使用以下命令运行index.js文件：

node app1.js

输出：

GeeksforGeeks (Outside)

  GeeksforGeeks (1)
  GeeksforGeeks (2)

示例 2：

文件名：index.js

Javascript

// Node.js program to demonstrate the
// console.groupCollapsed() method
 
// This code example demonstrate the method
// with parameter and nested groups
 
// Accessing console module
const console = require('console');
 
console.log("GeeksforGeeks ");
 
console.log("=========================");
console.log();
 
// Creating collapsed group
console.groupCollapsed("GeeksforGeeks (main Collapsed group)");
console.log();
 
// Printing First line of collapsed group
console.log("GeeksforGeeks (Outside)");
console.log();
 
// Creating First nested collapsed group
console.groupCollapsed("GeeksforGeeks (1st Nested group)");
console.log("GeeksforGeeks (1st line)");
console.log("Computer Science Portal (2nd line)");
 
// Ending the 1st nested group
console.groupEnd();
 
console.log();
console.log();
 
// Creating second nested collapsed group
console.groupCollapsed("GeeksforGeeks (2nd Nested group)");
console.log("Data Structure (1st line)");
console.log("Algorithms & segment tree (2nd line)");
 
// Ending the 2nd nested group
console.groupEnd();
 
console.log();
 
// Printing last line of Main group
console.log("Main group finished");
console.log();
 
// Calling groupEnd() method (It is used
// to end the group for more understanding
// the group method)
console.groupEnd();
 
// print from outside the Main group
console.log("GeeksforGeeks (Outside Last)");
 
console.log();
console.log("=========================");

输出：

GeeksforGeeks 
=========================

GeeksforGeeks (main Collapsed group)
  
  GeeksforGeeks (Outside)
  
  GeeksforGeeks (1st Nested group)  
    GeeksforGeeks (1st line)
    Computer Science Portal (2nd line)  
  
  
  GeeksforGeeks (2nd Nested group)      
    Data Structure (1st line)
    Algorithms & segment tree (2nd line)
  
  Main group finished
  
GeeksforGeeks (Outside Last)

=========================

参考： https://nodejs.org/api/console.html#console_console_groupcollapsed