<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("#ca").attr({ "href" : "https://cankaoshouce.com/jquery/", "title" : "jQuery Tutorial" }); });});</script></head><body><p><a href="https://cankaoshouce.com" title="some title" id="ca">cankaoshouce.com</a></p><button>Change href and title</button><p>Mouse over the link to see that the href attribute has changed and a title attribute is set.</p></body></html>