$.extend = function(target){
var deep, args = slice.call(arguments, 1)
if (typeof target == 'boolean') {
deep = target
target = args.shift()
}
args.forEach(function(arg){ extend(target, arg, deep) })
return target
}
扩展函数 第一个参数为boolean true 则深扩展，
zepto.qsa = function(element, selector){
var found,
maybeID = selector[0] == '#',
maybeClass = !maybeID && selector[0] == '.',
nameOnly = maybeID || maybeClass ? selector.slice(1) : selector, // Ensure that a 1 char tag name still gets checked
isSimple = simpleSelectorRE.test(nameOnly)
return (element.getElementById && isSimple && maybeID) ? // Safari DocumentFragment doesn't have getElementById
( (found = element.getElementById(nameOnly)) ? [found] : [] ) :
(element.nodeType !== 1 && element.nodeType !== 9 && element.nodeType !== 11) ? [] :
slice.call(
isSimple && !maybeID && element.getElementsByClassName ? // DocumentFragment doesn't have getElementsByClassName/TagName
maybeClass ? element.getElementsByClassName(nameOnly) : // If it's simple, it could be a class
element.getElementsByTagName(selector) : // Or a tag
element.querySelectorAll(selector) // Or it's not simple, and we need to query all
)
}
getElementByClassName 通过class获取节点
getElementByTagName 通过标签回去
获取单个选择器
$.contains = document.documentElement.contains ?
function(parent, node) {
return parent !== node && parent.contains(node)
} :
function(parent, node) {
while (node && (node = node.parentNode))
if (node === parent) return true
return false
}
document.documentElement.contains 检测某个节点下是否包含传入的子节点
$.type = type //检测对象类型
$.isFunction = isFunction //是否为函数
$.isWindow = isWindow //是否为window对象
$.isArray = isArray //是否为数组
$.isEmptyObject //是否为空对象
$.isNumeric //是否为有效数字
$.inArray //array的indexof
$.camelCase //驼峰命名
$.trim //去空
$.map //遍历函数，返回一个返回值的集合数组
$.each //遍历元素执行函数
$.grep //array的filter函数
代码仅供参考，具体功能可以自己扩展。
http://www.cnblogs.com/jiebba/p/6529854.html
http://www.cnblogs.com/jiebba 我的博客，来看吧！
如果有错误，请留言修改下 哦！
