js if和else if那里还能缩短吗，就是可以把这两段合并为一个吗，感觉挺多重复的

• Z时代
• 2024-02-21
• 分类：IT

function updateNumber(el,option)
        {
            let duration=option.duration;
            let beforeNumber=option.beforeNumber;
            let endNumber=option.endNumber;
            let oneNumber=(endNumber-beforeNumber)/(duration*60);
            let currentNumber=beforeNumber;
            return function()
            {
                currentNumber+=oneNumber;
                el.textContent=Math.floor(currentNumber);
                if(oneNumber > 0)
                {
                    if(currentNumber<endNumber)
                    {
                        if(currentNumber+oneNumber>endNumber)         
                            oneNumber=endNumber-currentNumber;
                        requestAnimationFrame(arguments.callee);
                    }  
                }
                else if(oneNumber < 0)
                {
                    if(currentNumber>endNumber)
                    {
                        console.log(oneNumber);
                        if(currentNumber+oneNumber<endNumber)         
                            oneNumber=endNumber-currentNumber;
                        requestAnimationFrame(arguments.callee);
                    }  
                }            
            }
        }

回答：

function updateNumber(el, option) {
      const { duration, beforeNumber, endNumber } = option;
      let oneNumber = (endNumber - beforeNumber) / (duration * 60);
      let currentNumber = beforeNumber;
      return function() {
        currentNumber += oneNumber;
        el.textContent = Math.floor(currentNumber);
        if (oneNumber > 0 && currentNumber < endNumber) {
          if (currentNumber + oneNumber > endNumber)
            oneNumber = endNumber - currentNumber;
          requestAnimationFrame(arguments.callee);
        }
        if (oneNumber < 0 && currentNumber > endNumber) {
          if (currentNumber + oneNumber < endNumber)
            oneNumber = endNumber - currentNumber;
          requestAnimationFrame(arguments.callee);
        }
      };
    }

回答：

function updateNumber(el, option) {
  let duration = option.duration;
  let beforeNumber = option.beforeNumber;
  let endNumber = option.endNumber;
  let oneNumber = (endNumber - beforeNumber) / (duration * 60);
  let currentNumber = beforeNumber;
  return function() {
    currentNumber += oneNumber;
    el.textContent = Math.floor(currentNumber);
    const rule =
      oneNumber > 0 &&
      currentNumber < endNumber &&
      currentNumber + oneNumber > endNumber;
    const rule1 =
      oneNumber < 0 &&
      currentNumber > endNumber &&
      currentNumber + oneNumber < endNumber;
    if (rule || rule1) {
      oneNumber = endNumber - currentNumber;
      requestAnimationFrame(arguments.callee);
    }
  };
}

回答：

if(oneNumber > 0 && currentNumber<endNumber && (currentNumber+oneNumber>endNumber)){
    oneNumber=endNumber-currentNumber;
    requestAnimationFrame(arguments.callee);
}else if (oneNumber < 0 && currentNumber>endNumber && (currentNumber+oneNumber<endNumber)){
    oneNumber=endNumber-currentNumber;
    requestAnimationFrame(arguments.callee);
}

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