<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script type="text/javascript" src="jquery-3.1.0.js"></script> <script type="text/javascript"> $(function(){ $("input[type='button']").click(function(){ alert("文本框内容:"+$("input:first").attr("type")); alert("文本框内容:"+$("input:first").attr("placeholder")); $("input:first").attr("value","张柳宁"); }) }) </script> </head> <body> <input type="text" placeholder="输入内容"/> <input type="button" value="按钮"/> </body> </html>
使用jQuery对象的attr()函数实现元素属性的获取的设置