JavaScript 循环综合指南

<code class="javascript">for (let i = 0; i < 10; i++) {
  // 代码块
}</code>

<code class="javascript">for (let i = 1; i <= 5; i++) {
  console.log(i); // 输出 1 到 5
}</code>

<code class="javascript">while (condition) {
  // 代码块
}</code>

<code class="javascript">let count = 0;
while (count < 5) {
  console.log(count); // 输出 0 到 4
  count++;
}</code>

<code class="javascript">do {
  // 代码块
} while (condition);</code>

<code class="javascript">let number = 0;
do {
  console.log(`number is: ${number}`); // 至少执行一次
  number++;
} while (number < 0);</code>

<code class="javascript">for (const key in object) {
  // 代码块
}</code>

<code class="javascript">const person = { firstName: "John", lastName: "Doe", age: 30 };
for (const key in person) {
  console.log(`${key}: ${person[key]}`);
}</code>

<code class="javascript">for (const value of iterable) {
  // 代码块
}</code>

<code class="javascript">const fruits = ["apple", "banana", "cherry"];
for (const fruit of fruits) {
  console.log(fruit);
}</code>

<code class="javascript">for (let i = 0; i < 10; i++) {
  if (i === 5) {
    break; // 循环在 i=5 时结束
  }
  console.log(i);
}</code>

<code class="javascript">for (let i = 0; i < 10; i++) {
  if (i === 5) {
    continue; // 跳过 i=5
  }
  console.log(i);
}</code>

<code class="javascript">for (let i = 1; i <= 3; i++) {
  for (let j = 1; j <= 2; j++) {
    console.log(`i = ${i}, j = ${j}`);
  }
}</code>

<code class="javascript">while (true) {
  // ... (需要 break 语句终止)
}</code>