RangeError

RangeError对象标明一个错误，当一个值不在其所允许的范围或者集合中。

语法

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

参数

message

可选，可读的错误描述

fileName

可选，包含造成异常代码的文件名

lineNumber

可选，造成异常的代码所在的行数

描述

试图传递一个number参数给一个范围内不包含该number的函数时则会引发RangeError。当传递一个不合法的length值作为Number.toPrecision()），会出现RangeError。.

属性

RangeError.prototype

允许在RangeError对象上附加属性。

方法

RangeError全局对象没有自带方法，但它通过可以原型链继承一些方法。

RangeError实例

属性

RangeError.prototype.constructor

Specifies the function that created an instance's prototype.

RangeError.prototype.message

Error message. Although ECMA-262 specifies that RangeError should provide its own message property, in SpiderMonkey, it inherits Error.prototype.message.

RangeError.prototype.name

Error name. Inherited from Error.

RangeError.prototype.fileName

Path to file that raised this error. Inherited from Error.

RangeError.prototype.lineNumber

Line number in file that raised this error. Inherited from Error.

RangeError.prototype.columnNumber

Column number in line that raised this error. Inherited from Error.

RangeError.prototype.stack

Stack trace. Inherited from Error.

方法

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

例子

使用RangeError

var check = function(num) {
  if (num < MIN || num > MAX) {
    throw new RangeError('Parameter must be between ' + MIN + ' and ' + MAX);
  }
};

try {
  check(500);
}
catch (e) {
  if (e instanceof RangeError) {
    // 处理越界错误
  }
}