<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <ul> <li>星期1</li> <li>星期2</li> <li>星期3</li> <li>星期4</li> <li>星期5</li> </ul> <script> var lis = document.querySelectorAll('li'); var ul = document.querySelector('ul') for (var i = 0; i < lis.length; i++) { //添加自定义属性index lis[i].index = i; lis[i].onclick = function() { ul.removeChild(this); console.log(this.index);//打印当前li的index } } </script> </body> </html>