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[转自：http://api.jquery.com/jQuery.each/]
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version added:
1.0 -
jQuery.each( collection, callback(indexInArray, valueOfElement) )
collectionThe object or array to iterate over.
callback(indexInArray, valueOfElement)The function that will be executed on every object.
The
$.each()function is not the same as
$(selector).each(), which is used to iterate, exclusively, over a jQuery object. The$.each()function can be used to iterate over any collection, whether it is a map (JavaScript object) or an array. In the case of an array, the callback is
passed an array index and a corresponding array value each time. (The value can also be accessed through thethiskeyword, but Javascript will always wrap thethisvalue as anObjecteven if it is a simple string or number
value.) The method returns its first argument, the object that was iterated.
jQuery AJAX 请求 参见：http://www.w3school.com.cn/jquery/jquery_ajax.asp
| 请求 | 描述 |
|---|---|
| $(selector).load(url,data,callback) | 把远程数据加载到被选的元素中 |
| $.ajax(options) | 把远程数据加载到 XMLHttpRequest 对象中 |
| $.get(url,data,callback,type) | 使用 HTTP GET 来加载远程数据 |
| $.post(url,data,callback,type) | 使用 HTTP POST 来加载远程数据 |
| $.getJSON(url,data,callback) | 使用 HTTP GET 来加载远程 JSON 数据 |
| $.getScript(url,callback) | 加载并执行远程的 JavaScript 文件 |