JavaScript输出方法全攻略

JavaScript 输出方法

JavaScript 提供了多种方式将数据输出到屏幕或控制台，适用于不同场景。以下是常见的输出方法：

console.log()
最常用的调试方法，将内容输出到浏览器控制台。支持字符串、变量、对象等多种数据类型。

console.log("Hello World"); 
let x = 10;
console.log("Value:", x);

document.write()
直接写入HTML文档，多用于测试环境。注意：在页面加载完成后使用会覆盖整个文档。

document.write("<h1>Dynamic Content</h1>");

innerHTML/innerText
通过DOM操作更新特定元素内容。innerHTML解析HTML标签，innerText只处理纯文本。

document.getElementById("demo").innerHTML = "New content";

alert()
弹出警告框显示信息，会阻塞代码执行直到用户确认。

alert("This is an alert message");

格式化输出技巧

模板字符串
使用反引号(`)实现多行字符串和变量插值，提升代码可读性。

const user = {name: "Alice", age: 25};
console.log(`User: ${user.name}, Age: ${user.age}`);

表格输出
console.table()以表格形式展示数组或对象，便于查看结构化数据。

const users = [{id:1, name:"Bob"}, {id:2, name:"Charlie"}];
console.table(users);

高级输出控制

条件化输出
通过console.assert()在条件为false时输出错误信息，不影响正常执行流。

console.assert(x > 0, "x must be positive");

分组日志
使用console.group()和console.groupEnd()创建可折叠的日志分组。

console.group("User Details");
console.log("Name: Alice");
console.log("Age: 25");
console.groupEnd();

样式化输出
在控制台应用CSS样式，使用%c占位符配合样式字符串。

console.log("%cStyled Text", "color: red; font-size: 20px;");

性能监控输出

计时功能
console.time()和console.timeEnd()配对使用测量代码执行时间。

console.time("Array init");
const arr = new Array(1000000).fill(0);
console.timeEnd("Array init");

性能分析
console.profile()启动性能分析，console.profileEnd()结束并生成报告。

console.profile("My Function");
myFunction();
console.profileEnd();

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