拖放，编辑器

How can I make a drag and drop editor like the one in wufoo.com form editor

For client side web applications, you can always look at the source.

And beware not to copy it 100%, just use it as a source of knowledge and use your imagination to create something new.

Usually client side applications are built using some sort of client-side framework. The more popular ones are (in no particular order):

• GWT
• YUI
• jQuery

Start by checking those out, maybe try one or two tutorials, that should get you started.