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<!DOCTYPE html><html lang="en"><head><title>Title</title><meta charset="utf-8"></head><body><div class="one">千万级数据并发解决方案</div><div class="three">CSS3-瞬间提升网页逼格的利器</div><div class="one two">千万级数据并发解决方案</div><div class="two three">在线商城系统开发</div><h3 class="one">千万级数据并发解决方案</h3><h3>jQuery-最流行的JS函数库</h3><p class="one">千万级数据并发解决方案</p><script>var x=document.getElementsByClassName('one'); //x是一个对象集合的数组for(i = 0; i < x.length; i++){x[i].style.background='green';x[i].style.height='50px';x[i].style.textAlign='center'x[i].style.color = 'red'}console.log(x)</script></body></html>
通过getElementsByClassName()获取元素的集合
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