JavaScript的API设计原则

) {

selector = selector.trim()

// If it's a html fragment, create nodes from it

// Note: In both Chrome 21 and Firefox 15, DOM error 12

// is thrown if the fragment doesn't begin with <

if (selector[0] == '<' && fragmentRE.test(selector))

dom = zepto.fragment(selector, RegExp.$1, context), selector = null

// If there's a context, create a collection on that context first, and select

// nodes from there

else if (context !== undefined) return $(context).find(selector)

// If it's a CSS selector, use it to select nodes.

else dom = zepto.qsa(document, selector)

}

// If a function is given, call it when the DOM is ready

else if (isFunction(selector)) return $(document).ready(selector)

// If a Zepto collection is given, just return it

else if (zepto.isZ(selector)) return selector

else {

// normalize array if an array of nodes is given

if (isArray(selector)) dom = compact(selector)

// Wrap DOM nodes.

else if (isObject(selector))

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