js的for循环list集合

for (let i = 0; i < array.length; i++) {
  console.log(array[i]);
}

for (const item of array) {
  console.log(item);
}

for (const index in array) {
  console.log(array[index]);
}

// 错误示例
for (let i = 0; i <= array.length; i++) { // 应该是 i < array.length
  console.log(array[i]);
}

// 错误示例
for (let i = 0; i < array.length; i++) {
  if (array[i] === 'removeMe') {
    array.splice(i, 1); // 这会导致索引错位
  }
}

// 正确示例（使用filter创建新数组）
const newArray = array.filter(item => item !== 'removeMe');

const numbers = [1, 2, 3, 4, 5];
const doubledNumbers = [];

for (let i = 0; i < numbers.length; i++) {
  doubledNumbers.push(numbers[i] * 2);
}

console.log(doubledNumbers); // 输出: [2, 4, 6, 8, 10]