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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(){ $("#p1").mouseenter(function(){ alert("您的鼠标移到了 id=p1 的元素上!"); }); }); </script> </head> <body> <p id="p1">鼠标指针进入此处,会看到弹窗。</p> </body> </html>