<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>index</title> <style> *{ font-family: 微软雅黑; } </style> </head> <body> <h1>aaaaaaaaaaaaaaaaaaaaaaaaaaaa</h1> <h1>aaaaaaaaaaaaaaaaaaaaaaaaaaaa</h1> <h1>aaaaaaaaaaaaaaaaaaaaaaaaaaaa</h1> <h1>aaaaaaaaaaaaaaaaaaaaaaaaaaaa</h1> <h1>aaaaaaaaaaaaaaaaaaaaaaaaaaaa</h1> <h1>aaaaaaaaaaaaaaaaaaaaaaaaaaaa</h1> </body> <script> hidobjs=document.getElementsByTagName(‘h1‘); for(i=0;i<hidobjs.length;i++){ hidobjs[i].style.background=‘#f0f‘; } </script> </html>
getElementsByTagName通过标签名获取元素对象集合
原文：https://www.cnblogs.com/xiong-hua/p/14199254.html