JS之间的功能

如何解决JS之间的功能

我需要功能之间的帮助。我的时钟是24小时。

我总是得到“ else”选项。代码有什么问题？

// Get time
var today = new Date();
var time = today.getHours();
console.log(time); // 8 o clock right now when I am testing

// Between function
Number.prototype.between = function(first,last) {
  return first < last ? this >= first && this <= last : this >= last && this <= first;
};

// Do something
if (time.between(7,9)) {
  console.log("between(7,9)",time.between(7,9))
}
if (time.between(9,15)) {
  console.log("between(9,15)",time.between(9,15))

}
if (time.between(15,18)) {
  console.log("between(15,18)",time.between(15,18))

}

// and so on
else {
  console.log("else")
}

解决方法

else仅连接最后一个if。只需写其他ifs

   // Get time
    var today = new Date();
    var time = today.getHours();
    console.log(time); // 8 o clock right now when I am testing
    
    // Between function
    Number.prototype.between = function(first,last) {
      return first < last ? this >= first && this <= last : this >= last && this <= first;
    };
    
    
    // Do something
    if (time.between(7,9)) {
      console.log("between(7,9)",time.between(7,9))
    }
    else if (time.between(9,15)) {
      console.log("between(9,15)",time.between(9,15))
    
    }
    else if (time.between(15,18)) {
      console.log("between(15,18)",time.between(15,18))
    
    }
    
    // and so on
    else {
      console.log("else")
    }