我如果想添加一个div class为为任意一层 怎么添加！用JS
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <div class="one"> <div class="two"> <div class="three"> <div class="four"></div> </div> </div> </div> </body> </html>
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我爱钱端
var one = document.getElementsByClassName('one')[0];one.className = "one find";
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