querySelector 只能返回遇到的第一个对象
querySelectorAll 返回所有的
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<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>获取常规元素</title>
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<body><ul><li class="newsitem">111111111</li><li class="newsitem">111111111</li><li class="newsitem">111111111</li></ul><ul><li class="adsitem">111111111</li><li class="adsitem">111111111</li><li class="adsitem">111111111</li></ul><script>// querySelector 只能返回遇到的第一个对象var item = document.querySelector("ul li")console.log(item)// querySelectorAll 返回所有的var item1 = document.querySelectorAll("ul li.newsitem")console.log(item1)</script>
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