javascript - 我需要根据数组的长度创建字符串值

Question

我需要根据数组的长度创建一个字符串值。

var array = ["left", "right", "top", "bottom"];
//list contain array of Object
 list.forEach((po) => {

//for example if the length of the list is 10. i need to generate the string for each loop like this 

// "left0"   for 1 loop i need this value 
// "right0"  for 2 loop i need this value
// "top0"      for 3 loop i need this value
// "bottom0"   for 4 loop i need this value

// "left1"     for 5 loop i need this value
// "right1"   for 6 loop i need this value
// "top1"     for 7 loop i need this value
// "bottom1"     for 8 loop i need this value

// "left2"   for 1 loop i need this value 
// "right2"  for 2 loop i need this value
}

请帮我解决这个问题。我发现很难生成字符串以及最后的数字，左、右、上、下应该按顺序排列，并且数字应该在 5 个循环后发生变化，如图所示

Answer 1

您可以使用列表项的索引和数组的长度来完成此操作。

var array = ["left", "right", "top", "bottom"];

// Dummy list array
var list = new Array(10).fill(0);

list.forEach((po, i) => {
  // based on index of list calculate position in array
  // by using remainder operator
  var j = i % array.length,
    // get repetion count by simple dividing by the length
    c = Math.floor(i / array.length);
  console.log(array[j] + c)
});