jquery可以拿到dom元素，但拿不到dom的宽高。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <script type="text/javascript" src="./jquery-1.10.1.min.js"></script> <script> $(document).ready(function() {//jquery可以拿到dom元素,但拿不到dom元素的宽高 var $image=$("image"); console.log($image); var $width=$image.width(); console.log("ready", $width); }); </script> <img src="https://img.alicdn.com/tfs/TB1P_MofwmTBuNjy1XbXXaMrVXa-190-140.gif" alt=""> </body> </html>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <script type="text/javascript" src="./jquery-1.10.1.min.js"></script> <script> //2.jQuery中编写多个入口函数,后面的不会覆盖前面的 $(document).ready(function() { alert("hello lnj1"); }); $(document).ready(function () { alert("hello lnj2"); }); </script> </body> </html>
