jquery in action2的学习笔记(二)


二：Bringing pages to life
with jQuery

<img id="myImage" src="image.gif" alt="jquery in action2的学习札记(二)" data-custom ="some value"/>

1：As an example of using the each() method, we could use the following code to set the
id property of every element in the DOM to a name composed of the element’s tag
name and position within the DOM:

Recall that the attr() method will return undefined if the attribute in question
doesn’t exist, so this statement will throw an error if the <p> element doesn’t possess
any class names.

We could solve this by first checking for the attribute



8：expand the width of all elements
in the wrapped set by 20 pixels as follows:

$('input,select').val(['one','two','three']);