jQuery的getText()方法源碼

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/*** Utility function for retrieving the text value of an array of DOM nodes* @param {Array|Element} elem*/getText = Sizzle.getText = function( elem ) {    var node,        ret = "",        i = 0,        nodeType = elem.nodeType;    if ( !nodeType ) {        // If no nodeType, this is expected to be an array        for ( ; (node = elem[i]); i++ ) {            // Do not traverse comment nodes            ret += getText( node );        }    } else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {        // Use textContent for elements        // innerText usage removed for consistency of new lines (see #11153)        if ( typeof elem.textContent === "string" ) {            return elem.textContent;        } else {            // Traverse its children            for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {                ret += getText( elem );            }        }    } else if ( nodeType === 3 || nodeType === 4 ) {        return elem.nodeValue;    }    // Do not include comment or processing instruction nodes    return ret;};