<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> </head> <body> <input type="button" value="修改屬性" id="bt"/> <div id="dv"></div> <!--引入js文件--> <script src="common.js"></script> <script> //凡是css中這個屬性是多個單詞的寫法,js代碼中DOM操作的時候,把-干掉,后面的單詞大寫 //點擊按鈕,修改div的寬高和背景顏色 my$("bt").onclick = function () { my$("dv").style.width = "300px"; my$("dv").style.height = "300px"; my$("dv").style.backgroundColor = "deeppink"; }; </script> </body> </html>