Sizzle系列之 setDocument
setDocument
源码解释:
/**
* Sets document-related variables once based on the current document
* @param {Element|Object} [doc] An element or document object to use to set the document
* @returns {Object} Returns the current document
*/
根据参数中给定element或document object来设置documetn,最后返回document
用到的一些element或document属性:
node.ownerDocument
document.documentElement
document.contains
document.compareDocumentPosition
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