jquery Register text box get focus empty, lose focus assignment Simple instance _jquery

In our development process, especially when the user registration will have an effect, is the text box to get focus empty prompt, if the user did not enter information lost focus assignment on our prompt.

This jquery register text box to get focus empty, lost focus of the simple example of the assignment is small series to share all the content, hope to give you a reference, but also hope that we support cloud habitat community.