JSLite - Object access

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each

Traverse a JSLite collection object and execute a function for each matching element. The this keyword points to the current item (passed as the second parameter of the function). If the function returns false, the traversal ends.

$("img").each(function(i){
    this.src = "test" + i + ".jpg";
});
//⇒ 找到所有的img对象给设置src  
//⇒ 返回 [ <img src="test0.jpg" />, <img src="test1.jpg" /> ]

map

Traverse all node objects in the node object collection and return a new collection object

$(".box").map(function(index,item){
    return $(this).text()
})
//⇒ 返回 ["12boxOne", "6", "11", "22123456", "7123123"]

forEach

Similar to each, forEach traversal will not stop.

//遍历数组
[1,5,2,3].forEach(function(item,index,array){
    console.log(item,index,array)
})
//遍历节点
$("img").forEach(function(item,index,array){
    console.log(item,index,array)
})

eq

Specifies which element of the index the set of matching elements is. An integer indicating the position of the element, in base 0. eq(index) ⇒ collection eq(-index) ⇒ collection

$("div").eq(0)//⇒ 返回数组第一个节点数组 [div#box.boxOne.box2.box3, init: function…]
$("div").eq(-1)//⇒ 倒数第一个节点数组
$("div").eq(-2)//⇒ 倒数第二个节点数组

first

Get the first element in the current object collection. first() ⇒ collection

$('form').first()

get

Get all node objects or a single node object in the current object collection.

$("div").get(0)//⇒ 返回节点 <div id="box" class="boxOne box2 box3" ></div>

index

Get the position of an element. When the elemen parameter is not given, returns the position of the current element in the sibling node. .index() //The position of the first element in the object relative to its sibling elements .index(selector)
.index(element)

$("#box").index()//⇒ 4
$("div").index("#box")//⇒ 2
$("div").index($("#box"))//⇒ 2
$("div").index($("#box")[0])//⇒ 2

indexOf

Get the position of an element in this array in the currently acquired node array.

$("div").indexOf($("#box")[0])
//⇒ 2

length

The number of elements in the object.

$("img").length;//⇒ 2