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<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>自定义方法，实现通过类名获取对象集合</title><style>.one{width:500px;height:500px;background-color: rgb(112, 236, 168);line-height: 100px;}</style></head><body><div class="one"><div class="one1">111122</div><div class="one2 one1">3333444</div><div class="one1">5555666。</div><div class="three">7777888</div><div class="three2">999</div></div><script>var ones = document.getElementsByClassName('one1');console.log(ones);for(var i = 0; i < ones.length; i++){ones[i].style.backgroundColor="red";ones[i].style.color="blue";}</script></body></html>
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