jQuery is a JavaScript framework that is compatible with CSS3, also compatible with a variety of browsers.
jQuery objects and DOM object item can be converted, but the function of the two objects can not mix and match with each other. JQuery object and can only use their own function
JQuery convert DOM object into an object, the syntax: jQuery (dom objects)
jQuery object converted into a DOM object syntax: ¥ username [index]
jQuery provides a ready () function to execute after the page has loaded successfully. And window.onload function type.