SyntaxError：意外的令牌{

Question

为什么我一直收到此错误：我的代码中有SyntaxError: Unexpected token {？

var sleepCheck = function(numHours) { 

    if (numHours >= 8) {
    return "You're getting plenty of sleep! Maybe even too much!"; 
    }

    else (numHours < 8 ) {
        return "Get some more shut eye!";
    };
}
console.log(sleepCheck(10));
console.log(sleepCheck(5));
console.log(sleepCheck(8));

Answer 1

typo错误：在if [if...else]

之后遗失else

var sleepCheck = function(numHours) {
  if (numHours >= 8) {
    return "You're getting plenty of sleep! Maybe even too much!";
  } else if (numHours < 8) {
    return "Get some more shut eye!";
  };
}
console.log(sleepCheck(10));
console.log(sleepCheck(5));
console.log(sleepCheck(8));

注意：如果您没有任何其他条件，则if(...)条件之后不需要else部分（如评论中所述）

var sleepCheck = function(numHours) {
  if (numHours >= 8) {
    return "You're getting plenty of sleep! Maybe even too much!";
  } else {
    return "Get some more shut eye!";
  };
}
console.log(sleepCheck(10));
console.log(sleepCheck(5));
console.log(sleepCheck(8));

Answer 2

var sleepCheck = function(numHours) {
  if (numHours >= 8) {
    return "You're getting plenty of sleep! Maybe even too much!";
  } else {
    return "Get some more shut eye!";
  };
}
console.log(sleepCheck(10));
console.log(sleepCheck(5));
console.log(sleepCheck(8));