String.prototype.trimRight()

trimEnd() 方法从一个字符串的末端移除空白字符。trimRight() 是这个方法的别名。

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语法

str.trimEnd();
str.trimRight();

返回值

一个新字符串,表示从调用字串的末(右)端除去空白。

描述

trimEnd() / trimRight()方法移除原字符串右端的连续空白符并返回,trimEnd() / trimRight()方法并不会直接修改原字符串本身。

别名

为了与 String.prototype.padEnd 等函数保持一致,标准方法名称为trimEnd。 但是,出于Web兼容性原因,trimRight仍然是trimEnd的别名。 在某些引擎中,这意味着:

String.prototype.trimRight.name === "trimEnd";

示例

使用trimEnd()

下面的例子输出了小写的字符串"   foo":

var str = "   foo  ";

alert(str.length); // 8

str = str.trimRight();  // 或写成str = str.trimEnd();
console.log(str.length); // 6
console.log(str);       // '   foo'

Specifications

Specification Status Comment
String.prototype.{trimStart,trimEnd}proposal Stage 4 Expected to be part of ES2019

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
trimEndChrome Full support 66
Full support 66
Full support 4
Alternate Name
Alternate Name Uses the non-standard name: trimRight
Edge Full support 12
Alternate Name
Full support 12
Alternate Name
Alternate Name Uses the non-standard name: trimRight
Firefox Full support 61
Full support 61
Full support 3.5
Alternate Name
Alternate Name Uses the non-standard name: trimRight
IE No support NoOpera Full support 53
Full support 53
Full support Yes
Alternate Name
Alternate Name Uses the non-standard name: trimRight
Safari Full support 12WebView Android Full support 66
Full support 66
Full support ≤37
Alternate Name
Alternate Name Uses the non-standard name: trimRight
Chrome Android Full support 66
Full support 66
Full support 18
Alternate Name
Alternate Name Uses the non-standard name: trimRight
Firefox Android Full support 61
Full support 61
Full support 4
Alternate Name
Alternate Name Uses the non-standard name: trimRight
Opera Android Full support 47
Full support 47
Full support Yes
Alternate Name
Alternate Name Uses the non-standard name: trimRight
Safari iOS Full support 12Samsung Internet Android Full support 9.0
Full support 9.0
Full support 1.0
Alternate Name
Alternate Name Uses the non-standard name: trimRight
nodejs Full support 10.0.0
Full support 10.0.0
Full support 0.12
Alternate Name
Alternate Name Uses the non-standard name: trimRight

Legend

Full support  
Full support
No support  
No support
Uses a non-standard name.
Uses a non-standard name.

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