JS：for循环与暂停 [英] JS: for loop with pauses

问题描述

如何满足某些条件时，可以暂停循环？在下面的例子中，循环只是一次显示所有的值，而我希望它在任何时候停止它的具体值（例如2）：

How can I make a loop pause when a certain condition is satisfied? In the example below loop just shows all values at once while I want it to stop any time it gets across specific value (e.g. 2):

a = [1,1,1,2,1,1,1,3,4,2,1]
for (var i = 0; i < a.length; i++) {
    if(a[i] == 2){
        setTimeout(console.log(a[i]), 1000)
    }else{
        console.log(a[i]);
    }
};

推荐答案

数组，暂停的时间（以毫秒为单位）以及暂停的时间。在函数内部，它将创建一个私有函数，用于遍历数组。如果pauseOn值被触发，setTimeout被用于在指定的pauseTime之后调用循环函数。

The below creates a function that takes 3 arguments, an array, the amount of time to pause (in milliseconds), and what to pause on. Inside the function it will create a private function that will be used to loop over the array. If the pauseOn value is encoutered a setTimeout is used to recall the loop function after the specified pauseTime

var arr = [1,1,1,2,1,1,1,3,4,2,1];

function iterateArray(arr,pauseTime,pauseOn){
   var currentIndex=0;

   function loop(){    
      for(i=currentIndex;i<arr.length; i++){
         console.log(arr[i]);
         if(arr[i]==pauseOn){
            currentIndex = i+1;
            setTimeout(loop,pauseTime);
            return;
         }
      }
   }
   loop();
}
iterateArray(arr,3000,2);

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