jQuery is an encapsulated function library that can be called directly. js library, the overlord in the field of DOM programming.
1. Selector
- basic selector
$("#demo")
$(".test")
$("p")
$("div,p")
$("div.test")
- level selector
$("ul>li") //父子
$("ul li") // 祖先
- filter selector
:eq(index) $("li:eq(2)") // select the element with index 2 of li
:odd // Select elements with odd numbers (interlace color change)
:even // select elements with even numbers
- filter selector (method)
.children(selector) $("ul").children("li"); ===$("ul>li")
. find(selector) $("ul").find("li") ===$("ul li")
.siblings(selector) //Find sibling nodes, excluding themselves
.parent() // find parent node
.eq(index) // $("li").eq(2) === $("li:eq(2)")
next() // next sibling node
prev() // previous sibling node