<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>Title</title> <style> .red { color: red; } .green { color: green; } </style></head><body><ul> <li class="red">哈哈0</li> <li class="red">哈哈1</li> <li class="red">哈哈2</li> <li class="red">哈哈3</li> <li class="red">哈哈4</li></ul><script> var liArr = document.getElementsByClassName('red');//一绿一红 // var liArr = document.querySelectorAll('.red');//全绿 for (var i = 0; i < liArr.length; i++) { liArr[i].className = 'green'; }</script></body></html>感谢各位指点,找到问题答案了.后面是一个小结:https://icbd.github.io/wiki/w...
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