文章目录
6. 控制台打印（Console）模拟Java日志打印格式美化对象打印（表格形式打印输出）日志等级输出（让其在控制台显示时有颜色提示）代码运行时间统计打印输出
6. 控制台打印（Console）
官方文档：/zh-CN/docs/Web/API/Console#用法
模拟Java日志打印格式
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title></head><body></body><script>let people = {name: "lrc",year: 18}let article = {id: "423432431sfsdf",content: "测试控制台接口"}//不建议：这样打印不出对象内部结构console.log("people：" + people + " article: " + article)console.log("people：%s article: %s", people, article)//建议 == 下面两种是一样的console.log("people：", people, "article: ", article)console.log("people：%o article：%o", people, article)</script></html>
美化对象打印（表格形式打印输出）
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title></head><body></body><script>let people = {name: "lrc",year: 18}let article = {id: "423432431sfsdf",content: "测试控制台接口"}console.table(people)console.table(article)let arrays = [people,article]console.table(arrays)</script></html>
日志等级输出（让其在控制台显示时有颜色提示）
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title></head><body></body><script>console.error("错误日志哦！！！")console.warn("警告日志哦！！！")console.log("普通日志哦！！！")</script></html>
代码运行时间统计打印输出
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title></head><body></body><script>console.time("代码时间统计");let people = {name: "lrc",year: 18}let article = {id: "423432431sfsdf",content: "测试控制台接口"}console.timeLog("代码时间统计");//不建议：这样打印不出对象内部结构console.log("people：" + people + " article: " + article)console.log("people：%s article: %s", people, article)//建议 == 下面两种是一样的console.log("people：", people, "article: ", article)console.log("people：%o article：%o", people, article)console.timeLog("代码时间统计");console.table(people)console.table(article)let arrays = [people,article]console.table(arrays)console.timeLog("代码时间统计");console.error("错误日志哦！！！")console.warn("警告日志哦！！！")console.log("普通日志哦！！！")console.timeEnd("代码时间统计");</script></html>
前端小知识：控制台打印（console）- 模拟Java日志打印 表格形式打印美化输出对象 代码运行时间统计
