Node.js trace_events.getEnabledCategories()用法及代碼示例

trace_events.getEnabledCategories()

• 返回： <string>

返回所有 currently-enabled 跟蹤事件類別的逗號分隔列表。當前啟用的跟蹤事件類別集由所有 currently-enabled Tracing 對象和使用 --trace-event-categories 標誌啟用的任何類別的聯合確定。

給定下麵的文件test.js，命令node --trace-event-categories node.perf test.js將在控製台打印'node.async_hooks,node.perf'。

const trace_events = require('node:trace_events');
const t1 = trace_events.createTracing({ categories: ['node.async_hooks'] });
const t2 = trace_events.createTracing({ categories: ['node.perf'] });
const t3 = trace_events.createTracing({ categories: ['v8'] });

t1.enable();
t2.enable();

console.log(trace_events.getEnabledCategories());