String.prototype.valueOf()

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valueOf() 方法返回一个初始对象: String

语法

str.valueOf()

返回结果

A string representing the primitive value of a given String object.

描述

The valueOf() method of String returns the primitive value of a String object as a string data type. This value is equivalent to String.prototype.toString().

此方法通常由JavaScript在内部调用,而不是在代码中显式调用。

示例

使用 valueOf()

var x = new String('Hello world');
console.log(x.valueOf()); // Displays 'Hello world'

规范

规范
ECMAScript (ECMA-262)
String.prototype.valueOf

浏览器兼容性

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
valueOfChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 4Opera Full support 3Safari Full support 1WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 1Samsung Internet Android Full support 1.0nodejs Full support 0.1.100

Legend

Full support  
Full support

参见