Detailed explanation of each method of jquery traversing array
How JQuery gets the object
$('#id'): Through the id of the element
$('tagName'): Through the tag name of the element
$('tagName tagName'): Pass the tag name of the element, eg: $('ul li')
$('tagName#id): Pass the element's id and tag name
$(':checkbox'): Get all elements whose input type is checkbox':
Eg:
<input type="checkbox" name="appetizers"
value="imperial"/>
$('span[price] input[type=text]') ：拿取下面的input元素
<span price="3">
<input type="text" name="imperial.quantity"
disabled="disabled" value="1"/>
</span>
$('div',$(this).parents('div:first'))：拿取该div的上（至少都是父节点）的第一个div节点
$('~ span:first',this)： locates the first sibling of this that's a <span> element.Lazy loading js file:
$.getScript
Example:
Html file:
Java code
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>$.getScript Example</title>
<link rel="stylesheet" type="text/css" href="../common.css">
<script type="text/javascript"
src="../scripts/jquery-1.2.1.js"></script>
<script type="text/javascript">
$(function(){
$('#loadButton').click(function(){
$.getScript(//在Firefox/3.0.1中会出现一个错误(语法错误,定义的变量不起作用,ff2没问题)
'new.stuff.js'//,function(){$('#inspectButton').click()}
);
});
$('#inspectButton').click(function(){
someFunction(someVariable);
test()
});
});
</script>
</head>
<body>
<button type="button" id="loadButton">Load</button>
<button type="button" id="inspectButton">Inspect</button>
</body>
</html>Js file:
Java code
alert("I'm inline!");
var someVariable = 'Value of someVariable';
function someFunction(value) {
alert(value);
}
function test() {
alert('test');
}
alert("I'm inline!");
var someVariable = 'Value of someVariable';
function someFunction(value) {
alert(value);
}
function test() {
alert('test');
}jquery array processing:
Java code
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Hi!</title>
<script type="text/javascript" src="../scripts/jquery-1.2.1.js">
</script>
<script type="text/javascript">
var $ = 'Hi!';
jQuery(function(){
alert('$ = '+ $);//这里的 $ 为 Hi!,把它变回jquery的符号:jQuery(function($){...}/这样就可以了
//alert(jQuery)
});
jQuery(function($){
//------------遍历数组 .each的使用-------------
var anArray = ['one','two','three'];
$.each(anArray,function(n,value) {
//do something here
//alert(n+' '+value);
});
var anObject = {one:1, two:2, three:3};
$.each(anObject,function(name,value) {
//do something here
//alert(name+' '+value);
});
//-----------过滤数组 .grep的使用------------
var originalArray =[99,101,103];
var bigNumbers = $.grep(originalArray,'a>100');//第2种写法,还可以用正则表达式来过滤
$.each(bigNumbers,function(n,value) {
//do something here
//alert(n+' '+value);
});
//------------转换数组 .map的使用------------
var strings = ['1','2','3','4','S','K','6'];
var values = $.map(strings,function(value){
var result = new Number(value);
return isNaN(result) ? null : result;//如果result不是数字则返回null（返回null在这里相当于不返回）
});
$.each(values,function(n,value) {
//do something here
//alert(value);
});
var characters = $.map(
['this','that','other thing'],
function(value){return value.split('');}//分离字符串用返回给characters
);
//alert(characters.length);
//------------.inArray(value,array)的使用------------返回value在array下标的位置，如果value不在array中则返回
-1
var index = $.inArray(2,[1,2,3,4,5]);
//alert(index);
//------------makeArray(obj)的使用------------将类数组对象转换为数组对象。
var arr = jQuery.makeArray(document.getElementsByTagName_r("div"));
//arr.reverse(); // 使用数组翻转函数
$.each(arr,function(n,value) {
//do something here
//alert(n+' '+value);
//alert(value.html());
});
var arr2 =$.unique(document.getElementsByTagName_r("div")); //获得唯一的对象，看API,说得很模
糊,http://docs.jquery.com/Utilities/jQuery.unique
alert();
$.each(arr2,function(n,value) {
//do something here
alert(n+' '+value);
});
});
</script>
</head>
<body>
<div>First</div><div>Second</div><div>Third</div><div>Fourth</div><div>Fourth</div>
</body>
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