string.toString
string.toString
toString()
方法返回指定对象的字符串形式。
语法
str.toString()
返回值
表示调用对象的字符串。
描述
String
对象覆盖了Object
对象的 toString
方法;并没有继承Object.toString()
。对于String
对象,toString
方法返回该对象的字符串形式,和String.prototype.valueOf()
方法返回值一样。
示例
使用 toString()
下例输出一个字符串对象(String object)的字符串值:
var x = new String('Hello world'
console.log(x.toString() // logs 'Hello world'
规范
Specification | Status | Comment |
---|---|---|
ECMAScript 3rd Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.1. |
ECMAScript 5.1 (ECMA-262)The definition of 'String.prototype.toString' in that specification. | Standard | |
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'String.prototype.toString' in that specification. | Standard | |
ECMAScript Latest Draft (ECMA-262)The definition of 'String.prototype.toString' in that specification. | Draft | |
浏览器兼容性
Feature | Chrome | Firefox | Edge | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |