String.prototype.trim()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
String 的 trim() 方法会从字符串的两端移除空白字符，并返回一个新的字符串，而不会修改原始字符串。
要返回一个仅从一端修剪空白字符的新字符串，请使用 trimStart() 或 trimEnd()。
尝试一下
const greeting = " Hello world! ";
console.log(greeting);
// Expected output: " Hello world! ";
console.log(greeting.trim());
// Expected output: "Hello world!";
语法
js
trim()
返回值
示例
使用 trim()
下面的示例从 str 的两端去除空白字符：
js
const str = " foo ";
console.log(str.trim()); // 'foo'
规范
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-string.prototype.trim |