JavaScript 條件語句 if/else if/else

Question

大家好！ 你能幫幫我嗎？ 我正在嘗試使用某些條件，但由於某些原因它們似乎被忽略了。 當我運行代碼時，彈出的隨機數是 93，它適合第一個聲明的語句 (if)，但是，即使為 true && true，它也會被忽略並移至最后一個語句。 我不懂為什么... ？？？

function loveMatching (name1, name2) {
    
    name1 = prompt ("Enter your name!");
    name2 = prompt ("Enter your crush name!");

   
 if (matchingPercentage() >= 70 && matchingPercentage() <=100) {

   document.write(" The compability between: " + name1 + " and " + name2 + " is of a " + matchingPercentage() + "%. You guys are meant to be together!");

  }
  else if( matchingPercentage() >=30 && matchingPercentage() <70) {
    document.write(" The compability between: " + name1 + " and " + name2 + " is of a " + matchingPercentage() + "%. Too close to fail!");
  }

 else {
  document.write(" The compability between: " + name1 + " and " + name2 + " is of a " + matchingPercentage() + "%. You better look in another direction!");
 }

  }

function matchingPercentage() {
    var n = Math.random();
    var n = Math.floor(n * 100) + 1;
return n;
}



loveMatching();

Answer 1

您每次檢查時都在計算一個新的匹配百分比，在同一個條件下多次。 你只需要在開始時做一次：

function loveMatching (name1, name2) {
    
    name1 = prompt ("Enter your name!");
    name2 = prompt ("Enter your crush name!");
    const matchPercent = matchingPercentage(); // call one time
   
 if (matchPercent >= 70 && matchPercent <=100) {

   document.write(" The compability between: " + name1 + " and " + name2 + " is of a " + matchPercent + "%. You guys are meant to be together!");

  }
  else if( matchPercent >=30 && matchPercent <70) {
    document.write(" The compability between: " + name1 + " and " + name2 + " is of a " + matchPercent + "%. Too close to fail!");
  }

 else {
  document.write(" The compability between: " + name1 + " and " + name2 + " is of a " + matchPercent + "%. You better look in another direction!");
 }

}