<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> div { width: 200px; height: 200px; background-color: pink; } .cls { background-color: deeppink; } </style> </head> <body> <input type="button" value="移除屬性" id="bt"/> <div score = "10" id="dv" class="cls"></div> <script src="common.js"></script> <script> //點擊按鈕移除元素的自定義屬性 my$("bt").onclick = function () { my$("dv").removeAttribute("score"); //移除元素的類樣式 //值沒有了但是屬性還有 my$("dv").className = ""; //也可以移除元素自帶的屬性 my$("dv").removeAttribute("class"); }; </script> </body> </html>