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) |
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