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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ $("img").attr("width","500"); }); }); </script> </head> <body> <img src="img_pulpitrock.jpg" alt="Pulpit Rock" width="284" height="213"> <br> <button>为图片设置width属性</button> </body> </html>