TypeError

TypeError(类型错误) 对象用来表示值的类型非预期类型时发生的错误。

语法

new TypeError([message[, fileName[, lineNumber]]])

参数

message 消息
可选. 描述此错误
fileName 文件名
可选. 引起该异常的代码所在的文件的名字。
lineNumber 行号
可选. 引起该异常的代码的行号。

描述

当传入函数的操作数参数的类型并非操作符或函数所预期的类型时,将抛出一个 TypeError 类型错误。

属性

TypeError.prototype
允许为一个 TypeError 类型错误附加属性。

方法

全局 TypeError 不包含任何方法,不过,它将从原型链中继承一些方法。

TypeError 类型错误实例

属性

TypeError.prototype.constructor
Specifies the function that created an instance's prototype.
TypeError.prototype.message
Error message. Although ECMA-262 specifies that TypeError should provide its own message property, in SpiderMonkey, it inherits Error.prototype.message.
TypeError.prototype.name
Error name. Inherited from Error.
TypeError.prototype.fileName
Path to file that raised this error. Inherited from Error.
TypeError.prototype.lineNumber
Line number in file that raised this error. Inherited from Error.
TypeError.prototype.columnNumber
Column number in line that raised this error. Inherited from Error.
TypeError.prototype.stack
Stack trace. Inherited from Error.

方法

Although the TypeError prototype object does not contain any methods of its own, TypeError instances do inherit some methods through the prototype chain.

示例

示例: 捕获类型错误

try {
  null.f();
} catch (e) {
  console.log(e instanceof TypeError); // true
  console.log(e.message);              // "null has no properties"
  console.log(e.name);                 // "TypeError"
  console.log(e.fileName);             // "Scratchpad/1"
  console.log(e.lineNumber);           // 2
  console.log(e.columnNumber);         // 2
  console.log(e.stack);                // "@Scratchpad/2:2:3\n"
}

示例: 创建一个类型错误

try {
  throw new TypeError('Hello', "someFile.js", 10);
} catch (e) {
  console.log(e instanceof TypeError); // true
  console.log(e.message);              // "Hello"
  console.log(e.name);                 // "TypeError"
  console.log(e.fileName);             // "someFile.js"
  console.log(e.lineNumber);           // 10
  console.log(e.columnNumber);         // 0
  console.log(e.stack);                // "@Scratchpad/2:2:9\n"
}

规范

规范 状态 说明
ECMAScript 3rd Edition (ECMA-262)
TypeError
Standard 初始定义。
ECMAScript 5.1 (ECMA-262)
TypeError
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
TypeError
Standard  

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