Definition and usage
Theattr() method sets or returns the attribute value of the selected element.
According to the different parameters of this method, its working method is also different.
Example 1
Set the attributes and values of the selected element.
<html> <head> <script type="text/javascript" src="/jquery/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("button").click(function(){ $("img").attr("width","180"); }); }); </script> </head> <body> <img src="/i/eg_smile.gif" /> <br /> <button>设置图像的 width 属性</button> </body> </html>
Example 2
Returns the attribute value of the selected element.
<html> <head> <script type="text/javascript" src="/jquery/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("button").click(function(){ alert("Image width " + $("img").attr("width")); }); }); </script> </head> <body> <img src="/i/eg_smile.gif" width="128" height="128" /> <br /> <button>返回图像的宽度</button> </body> </html>
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