javascript - 将 for 循环的一部分放入 javascript 的函数中

Question

我有几个函数使用下面给出的 for 循环。

function startClaw(dir){
    var readCount = 0;
    for(var isRead in qdata){
        readCount++;
        if(qdata[isRead]['reading'] == true){
            return;
        }else if(readCount == 5){
            isAnimating = $("#claw").is(':animated');
            if(!isAnimating){// prevents multiple clicks during animation
                if(isMoving || isDropping){ return; }
                MCI = setInterval(function(){ moveClaw(dir); },10);
                //console.log("startClaw:" + dir);
                stopSwingClaw();    
            }
        }
    }
}
//.................................................................
function dropClaw(){
    var readCount = 0;
    for(var isRead in qdata){
        readCount++;
        if(qdata[isRead]['reading'] == true){
            return;
        }else if(readCount == 5){
            if(isDropping){ return; } //prevent multiple clicks
            stopSwingClaw();
            isDropping = true;  
            MCI = setInterval(moveDown,20); //start heartbeat
        }
    }
}

不同函数中 else if 语句中的所有内容都不同。我想知道是否有任何方法可以将 for 循环的“部分”放在 else if 外部，放入其自己的函数中。我觉得我很久以前就见过这个或做过这个，但我忘记了，我找不到任何例子。谢谢大家!

Answer 1

预览一下，我发现这和上面的类似。两个区别(看起来)是，计数被传递给函数，以防它们需要在 if 语句中进行不同的检查，并且它正在检查返回值是什么，因为它看起来像是从循环中返回 if条件满足。下面代码的注释中有注释。

function startClaw(dir) {
  // Pass a function as a callback to the method which expects to receive the count as a param
  doReadCount(qdata, function(theCount) { 
    if (theCount === 5) {
      isAnimating = $("#claw").is(':animated');
      if (!isAnimating) { // prevents multiple clicks during animation
        if (isMoving || isDropping) {
          return true;
        }
        MCI = setInterval(function() { moveClaw(dir); }, 10);
        //console.log("startClaw:" + dir);
        stopSwingClaw();
      }

      return false;
  });
}
//.................................................................
function dropClaw() {
  // Pass a function as a callback to the method which expects to receive the count as a param
  doReadCount(qdata, function(theCount) {
    if (theCount === 5) {
      if (isDropping) {
        return;
      } //prevent multiple clicks

      stopSwingClaw();
      isDropping = true;
      MCI = setInterval(moveDown,20); //start heartbeat
    }
  });
}

function doReadCount(qdata, elseFunction) {
  var readCount = 0;
  var elseReturn;
  for (var isRead in qdata) {
      readCount++;
      if (qdata[isRead]['reading'] == true) {
                return;
      } else {
        // call the function that was sent and pass it the current read count. If the return is true, then also return true here
        elseReturn = elseFunction(readCount);
        if (elseReturn) {
            return;
        }
      }
    }
  }