JavaScript 乐透号码选择器 - 需要按数字顺序显示结果

Question

今天我自己用 JavaScript 编写了第一个程序(耶!)。它是一个乐透号码选择器，可以从 1 到 49 之间随机选择我的六个彩票号码。虽然它看起来工作正常，没有重复，但我希望程序按数字顺序将数字打印到警报框中。任何帮助，将不胜感激。我的代码如下:

var firstNumber = Math.round(Math.random() * 49);
var secondNumber = Math.round(Math.random() * 49);
var thirdNumber = Math.round(Math.random() * 49);
var fourthNumber = Math.round(Math.random() * 49);
var fifthNumber = Math.round(Math.random() * 49);
var sixthNumber = Math.round(Math.random() * 49); 


 if(firstNumber === secondNumber || firstNumber === thirdNumber || 
    firstNumber === fourthNumber || firstNumber === fifthNumber ||           
    firstNumber === sixthNumber || firstNumber === 0) {
      Math.round(Math.random() * 49);
 } else if(secondNumber === firstNumber || secondNumber === thirdNumber || 
           secondNumber === fourthNumber || secondNumber === fifthNumber || 
           secondNumber === sixthNumber || secondNumber === 0) {
      Math.round(Math.random() * 49);
} else if (thirdNumber === firstNumber || thirdNumber === secondNumber || 
           thirdNumber === fourthNumber || thirdNumber === fifthNumber || 
           thirdNumber === sixthNumber || thirdNumber === 0) {
      Math.round(Math.random() * 49);
} else if (fourthNumber === firstNumber || fourthNumber === secondNumber || 
           fourthNumber === thirdNumber || fourthNumber === fifthNumber || 
           fourthNumber === sixthNumber || fourthNumber === 0) {
      Math.round(Math.random() * 49);
} else if(fifthNumber === firstNumber || fifthNumber === secondNumber || 
          fifthNumber === thirdNumber || fifthNumber === fourthNumber || 
          fifthNumber === sixthNumber || fifthNumber === 0){
      Math.round(Math.random() * 49);
} else if(sixthNumber === firstNumber || sixthNumber === secondNumber || 
          sixthNumber === thirdNumber || sixthNumber === fourthNumber || 
          sixthNumber === fifthNumber || sixthNumber === 0) {
      Math.round(Math.random() * 49);
} else {
      alert(firstNumber + ", " + secondNumber + ", " + thirdNumber + ", " + 
      fourthNumber + ", " + fifthNumber + ", " + sixthNumber);
}

Answer 1

可能有更有效的方法来解决这个问题。尝试一下:

var min = 1,
    max = 49,
    total = 6,
    nums = [];

// For [total] times
for(var i=0; i<total; i++){
  // Generate a random number between [min] and [max]
  var num = Math.floor( Math.random() * max + min );
  // If number already there, repeat
  if( nums.indexOf(num) > -1 ){ i--; continue; }
  // Add the number to the array
  nums.push(num);
}

// Sort and show the resulting array, comma separated
alert( nums.sort(sortNumber).join(', ') );

function sortNumber(a,b) {
    return a - b;
}