var x = [0, 3, 1, 2]; x.reverse() // [2, 1, 3, 0] x.join(" – ") // "2 - 1 - 3 - 0" x.pop() // [2, 1, 3] x.unshift(-1) // [-1, 2, 1, 3] x.shift() // [2, 1, 3] x.sort() // [1, 2, 3] x.splice(1, 2) // 用于插入、删除或替换数组元素，这里为删除从index=1开始的2个元素
9.4 数组为对象，所以始终为true
10. MAP
The map type is used by the AJAX function to hold the data of a request. This type could be a string, an array<form elements>, a jQuery object with form elements or an object with key/value pairs. In the last case, it is possible to assign multiple values to one key by assigning an array. As below: {'key[]':['valuea','valueb']}
11. FUNCTION:匿名和有名两种
11.1 Context、Call和Apply
In JavaScript, the variable "this" always refers to the current context. $(document).ready(function() { // this refers to window.document}); $("a").click(function() { // this refers to an anchor DOM element });
12. SELECTOR
There are lot of plugins that leverage jQuery's selectors in other ways. The validation plugin accepts a selector to specify a dependency, whether an input is required or not:
emailrules: { required: "#email:filled" }
This would make a checkbox with name "emailrules" required only if the user entered an email address in the email field, selected via its id, filtered via a custom selector ":filled" that the validation plugin provides.
13. EVENT
DOM标准事件包括：blur, focus, load, resize, scroll, unload, beforeunload, click, dblclick, mousedown, mouseup, mousemove, mouseover, mouseout, mouseenter, mouseleave, change, select, submit, keydown, keypress, andkeyup
14. JQUERY
JQUERY对象包含DOM元素的集合。比如$('p')即返回所有<p>...</p>
JQUERY对象行为类似数组，也有length属性，也可以通过index访问DOM元素集合中的某个。但是不是数组，不具备数组的某些方法，比如join()。
许多jQuery方法返回jQuery对象本身，所以可以采用链式调用：
$("p").css("color", "red").find(".special").css("color", "green");
但是如果你调用的方法会破坏jQuery对象，比如find()和filter()，则返回的不是原对象。要返回到原对象只需要再调用end()方法即可。
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