语法错误：返回不在函数中

¥Message

SyntaxError: Illegal return statement (V8-based)
SyntaxError: return not in function (Firefox)
SyntaxError: Return statements are only valid inside functions. (Safari)

¥Error type

SyntaxError。

¥What went wrong?

return 语句在 function 之外被调用。也许某处缺少大括号？return 语句必须在函数中，因为它结束函数执行并指定要返回给函数调用者的值。

¥A return statement is called outside of a function. Maybe there are missing curly braces somewhere? The return statement must be in a function, because it ends function execution and specifies a value to be returned to the function caller.

¥Examples

¥Missing curly braces

function cheer(score) {
  if (score === 147)
    return "Maximum!";
  }
  if (score > 100) {
    return "Century!";
  }
}

// SyntaxError: return not in function

乍一看，大括号看起来是正确的，但此代码片段在第一个 if 语句之后缺少 {。正确的是：

¥The curly braces look correct at a first glance, but this code snippet is missing a { after the first if statement. Correct would be:

function cheer(score) {
  if (score === 147) {
    return "Maximum!";
  }
  if (score > 100) {
    return "Century!";
  }
}

¥See also

• return