javascript - 如果实现了 switch case，我如何退出循环(循环内有一个开关)

Question

如果实现了 switch-case，我如何退出循环(循环内有一个 switch)。

function playInbestPlace() {
  console.log("hello from playInbestPlace ")
  findEmptyarea();
  for (var i = 0; i < indexOfEmpty.length; i++) {
    var elem = indexOfEmpty[i];
    switch (elem) {
      case 0:
        cells[elem].childNodes[0].append("o");
        break;
      case 2:
        cells[elem].childNodes[0].append("o");
        break;
      case 4:
        cells[elem].childNodes[0].append("o");
        break;
      case 6:
        cells[elem].childNodes[0].append("o");
        break;
      case 8:
        cells[elem].childNodes[0].append("o");
        break;
    }
  }
}

如果任何情况有效，我希望它能够被释放。

Answer 1

您可以添加一个变量 found 并在其为 true 时跳出循环:

function playInbestPlace() {
  console.log("hello from playInbestPlace ")
  findEmptyarea();
  for (var i = 0; i < indexOfEmpty.length; i++) {
    var elem = indexOfEmpty[i];

    var found = false; // initial found is false

    switch (elem) {
      case 0:
        cells[elem].childNodes[0].append("o");
        found = true;
        break;
      case 2:
        cells[elem].childNodes[0].append("o");
        found = true;
        break;
      case 4:
        cells[elem].childNodes[0].append("o");
        found = true;
        break;
      case 6:
        cells[elem].childNodes[0].append("o");
        found = true;
        break;
      case 8:
        cells[elem].childNodes[0].append("o");
        found = true;
        break;
    }

    if(found) // break out if it's true
        break;
  }
}