xxxxxxxxxx<html><head><meta charset="utf-8"><title>W3Cschool教程(w3cschool.cn)</title><style> button{color:#000000;} </style> </head><body> <button onclick=document.styleSheets[0].rules[0].style.color='red'> 点击按钮直接修改style标签里button选择符使按钮改为红色 </button> </body></html>