上代码：
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title></title> 6 </head> 7 <body> 8 <div id="student"data-id="1505110034"data-name="小乖"data-date-of-birth>哈哈</div> 9 10 <script> 11 12 var el = document.querySelector('#student'); 13 14 console.log(el.id); 15 16 console.log(el.dataset); 17 18 console.log(el.dataset.id); 19 20 console.log(el.dataset.name); 21 22 console.log(el.dataset.dateOfBirth); 23 24 el.dataset.dateOfBirth ='1996-09-26'; 25 26 console.log('someDataAttr' in el.dataset); 27 28 el.dataset.someDataAttr ='mydata'; 29 30 console.log('someDataAttr' in el.dataset); 31 </script> 32 </body> 33 </html>
效果图：
