概述
toString()
方法返回一个指定的错误对象(Error object)的字符串表示。
语法
e.toString();
描述
Object.prototype.toString()
方法。该方法实现如下:(假定 Object
和 String
没有被更改):
Error.prototype.toString = function() { "use strict"; var obj = Object(this); if (obj !== this) throw new TypeError(); var name = this.name; name = (name === undefined) ? "Error" : String(name); var msg = this.message; msg = (msg === undefined) ? "" : String(msg); if (name === "") return msg; if (msg === "") return name; return name + ": " + msg; };
示例
var e = new Error("fatal error"); print(e.toString()); // "Error: fatal error" e.name = undefined; print(e.toString()); // "Error: fatal error" e.name = ""; print(e.toString()); // "fatal error" e.message = undefined; print(e.toString()); // "Error" e.name = "hello"; print(e.toString()); // "hello"
规范
规范版本 | 规范状态 | 注解 |
---|---|---|
ECMAScript 1st Edition. | Standard | Initial definition. Implemented in JavaScript 1.1 |
ECMAScript 5.1 (ECMA-262) Error.prototype.toString |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) Error.prototype.toString |
Standard |
浏览器兼容性
We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains.
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Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |