MDN wants to learn about developers like you: https://qsurvey.mozilla.com/s3/MDN-dev-survey

RangeError: argument is not a valid code point

错误信息

RangeError: {0} is not a valid code point (Firefox)
RangeError: Invalid code point {0} (Chrome)

错误类型

RangeError

什么地方出错了?

 String.fromCodePoint() 这个方法只能接受有效的码位(code point) 。

码位( code point)是组成码空间(或代码页)的数值,范围是 0 到 0x10FFFF。

 NaN,负整数(-1),非整数(3.14),或编号大于0x10FFFF (1114111) 的字符,无法使用该方法。

范例

无效的例子

String.fromCodePoint('_');      // RangeError
String.fromCodePoint(Infinity); // RangeError
String.fromCodePoint(-1);       // RangeError
String.fromCodePoint(3.14);     // RangeError
String.fromCodePoint(3e-2);     // RangeError
String.fromCodePoint(NaN);      // RangeError

有效的例子

String.fromCodePoint(42);       // "*"
String.fromCodePoint(65, 90);   // "AZ"
String.fromCodePoint(0x404);    // "\u0404"
String.fromCodePoint(0x2F804);  // "\uD87E\uDC04"
String.fromCodePoint(194564);   // "\uD87E\uDC04"
String.fromCodePoint(0x1D306, 0x61, 0x1D307) // "\uD834\uDF06a\uD834\uDF07"

相关链接

文档标签和贡献者

 此页面的贡献者: YYYxt, Cattla
 最后编辑者: YYYxt,