// 遍历 jQuery 对象
$(selector).each(function(index, element) {
  // 处理代码
});

// 遍历数组或类数组对象
$.each(arrayOrObject, function(index, value) {
  // 处理代码
});

$('li').each(function(index, element) {
  console.log('索引:', index, '文本内容:', $(element).text());
});

var colors = ['red', 'green', 'blue'];
$.each(colors, function(index, value) {
  console.log('索引:', index, '颜色:', value);
});

var person = {name: 'John', age: 30, city: 'New York'};
$.each(person, function(key, value) {
  console.log('属性:', key, '值:', value);
});

$('li').each(function(index) {
  if (index === 2) return false; // 终止循环
  console.log(index);
});

$('li').each(function(index) {
  if (index === 1) return true; // 跳过索引1
  console.log(index);
});

var obj = {b: 2, a: 1};
var arr = Object.keys(obj).sort().map(function(key) {
  return {key: key, value: obj[key]};
});

$.each(arr, function(index, item) {
  console.log(index, item.key, item.value);
});