在此页

• 句法
• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

toString() method returns a string representing the specified Error 对象。

句法

e.toString()
					

返回值

A string representing the specified Error 对象。

描述

Error object overrides the Object.prototype.toString() method inherited by all objects. Its semantics are as follows (assuming Object and String have their original values):

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;
};
					

范例

Using toString()

var e = new Error('fatal error');
console.log(e.toString()); // 'Error: fatal error'
e.name = undefined;
console.log(e.toString()); // 'Error: fatal error'
e.name = '';
console.log(e.toString()); // 'fatal error'
e.message = undefined;
console.log(e.toString()); // ''
e.name = 'hello';
console.log(e.toString()); // 'hello'
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Error.prototype.toString' in that specification.

浏览器兼容性

The compatibility table on 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. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
toString	Chrome 1	Edge 12	Firefox 1	IE 6	Opera 4	Safari 1	WebView Android 1	Chrome Android 18	Firefox Android 4	Opera Android 10.1	Safari iOS 1	Samsung Internet Android 1.0	nodejs 0.1.100

图例

完整支持

完整支持

另请参阅

• Error.prototype.toSource()

元数据

• 最后修改： May 20, 2020

相关话题

1. 标准内置对象
2. Error
3. 特性
   1. Error.prototype.columnNumber
   2. Error.prototype.fileName
   3. Error.prototype.lineNumber
   4. Error.prototype.message
   5. Error.prototype.name
   6. Error.prototype.stack
4. 方法
   1. Error.prototype.toSource()
   2. Error.prototype.toString()
5. 相关页面：
6. EvalError
7. InternalError
8. RangeError
9. ReferenceError
10. SyntaxError
11. TypeError
12. URIError
13. 继承：
14. Function
15. 特性
    1. Function.arguments
    2. Function.caller
    3. Function.displayName
    4. Function.length
    5. Function.name
16. 方法
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toSource()
    5. Function.prototype.toString()
17. Object
18. 特性
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
19. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()