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馃殌绛涢€夋暟鎹細鎵惧噯浣犺鐨勯偅棰楁槦

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javascript澶嶅埗
// 閿欒绀鸿寖锛氭瘡娆￠兘閲嶆柊鏌ユ壘DOM
$('.user-list li').each(function() {
  if($(this).data('isVip')) { /* 鎿嶄綔 */ }
})

// 姝ｇ‘濮垮娍锛氬厛缂撳瓨鍐嶆搷浣?鉁旓笍
const $users = $('.user-list li') // 馃搶閲嶇偣锛佸厛瀛樿捣鏉?/span>
const vips = $users.filter('[data-is-vip="true"]') 
vips.addClass('gold-member')

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javascript澶嶅埗
// 鐏鹃毦浠ｇ爜锛佹瘡娆″惊鐜兘閲嶆柊鏌ヨDOM 鉂?/span>
$('.item').each(function() {
  $(this).find('.price').text('锟?9')
})

// 绁炵骇浼樺寲锛氫竴娆℃€ф悶瀹?鉁旓笍
const $prices = $('.item .price')
$prices.text('锟?9') 

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馃憠涓句釜缁煎悎妗堜緥锛氬鐞嗙數鍟嗗晢鍝佸垪琛?/p>

javascript澶嶅埗
// 鎵惧嚭浠锋牸浣庝簬100鍏冪殑宸蹭笂鏋跺晢鍝?/span>
const cheapGoods = $('.product')
  .filter('.on-shelf')
  .map(function() {
    const price = parseFloat($(this).find('.price').text())
    return price < 100 ? this : null
  })
  .get()

// 缁欒繖浜涘晢鍝佹墦鏍?/span>
$(cheapGoods).addClass('budget-choice')

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javascript澶嶅埗
const wrongQuestions = $('.question')
  .map(function() {
    return {
      id: $(this).data('id'),
      isCorrect: $(this).hasClass('correct')
    }
  })
  .get()
  .filter(q => !q.isCorrect)

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javascript澶嶅埗
const menuData = [
  ['棣栭〉', '鍏充簬鎴戜滑'],
  ['浜у搧', ['鎵嬫満', '閰嶄欢']]
]

const flatMenu = $.map(menuData, function(subArr) {
  return $.isArray(subArr) ? subArr : [subArr]
})

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