jQuery遍历函数$.each()

collection   遍历的对象或数组

callback(indexInArray,valueOfElement) 在每一个对象上调用的函数

说明

一个通用的遍历函数 , 可以用来遍历对象和数组. 数组和含有一个length属性的伪数组对象(伪数组对象如function的arguments对象)以数字索引进行遍历,从0到length-1,其它的对象通过的属性进行遍历.

$.each()与$(selector).each()不同, 后者专用于jquery对象的遍历,前者可用于遍历任何的集合(无论是数组或对象),如果是数组,回调函数每次传入数组的索引和对应的值(值亦可以通过this关键字获取,但javascript总会包装this值作为一个对象—尽管是一个字符串或是一个数字),方法会返回被遍历对象的第一参数

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//例子:———传入数组

$.each([52, 97], function(index, value) {
alert(index + ‘: ‘ + value);
});

//输出

0: 52
1: 97

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//例子:———如果一个映射作为集合使用,回调函数每次传入一个键-值对

var map = {
‘flammable’: ‘inflammable’,
‘duh’: ‘no duh’
};
$.each(map, function(key, value) {
alert(key + ‘: ‘ + value);
});

//输出

flammable: inflammable
duh: no duh

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//例子:———回调函数中 return false时可以退出$.each(),如果返回一个非false 即会像在for循环中使用continue 一样, 会立即进入下一个遍历

  div { color:blue; }

  div#five { color:red; }

    var arr = ["one", "two", "three", "four", "five" ];//数组

    var obj = {one:1, two:2, three:3, four:4, five:5 }; // 对象

    jQuery.each(arr,function() {  // this 指定值

      $(“#” +this).text(“Mine is ” + this + “.”);  // this指向为数组的值,如one, two

      return (this != “three”); // 如果this = three 则退出遍历

   });

    jQuery.each(obj,function(i, val) {  // i 指向键, val指定值

      $(“#” +i).append(document.createTextNode(” ? ” + val));

    });

// 输出

Mine is one. ? 1

Mine is two. ? 2

Mine is three. ? 3

- 4

- 5

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//例子:———遍历数组的项, 传入index和value

$.each( ['a','b','c'], function(i, l){
alert( “Index #” + i + “: ” + l );
});

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//例子:———遍历对象的属性,传入 key和value

$.each( { name: “John”, lang: “JS” }, function(k, v){
alert( “Key: ” + k + “, Value: ” + v );
});

正自评论的例子:

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1. 如果不想输出第一项 (使用retrun true)进入 下一遍历

var myArray=["skipThis", "dothis", "andThis"];
$.each(myArray, function(index, value) {
if (index == 0) {
return true; // equivalent to ‘continue’ with a normal for loop
}
// else do stuff…
alert (index + “: “+ value);
});

其它例子待续 …………..