jQuery3.0中的buildFragment私有函数详解

function buildFragment( elems, context, scripts, selection, ignored ) {var elem, tmp, tag, wrap, contains, j,fragment = context.createDocumentFragment(),nodes = [],i = 0,l = elems.length;for ( ; i < l; i++ ) {elem = elems[ i ];if ( elem || elem === 0 ) {// Add nodes directlyif ( jQuery.type( elem ) === "object" ) {// Support: Android <=4.0 only, PhantomJS 1 only// push.apply(_, arraylike) throws on ancient WebKitjQuery.merge( nodes, elem.nodeType ? [ elem ] : elem );// Convert non-html into a text node} else if ( !rhtml.test( elem ) ) {nodes.push( context.createTextNode( elem ) );// Convert html into DOM nodes} else {tmp = tmp || fragment.appendChild( context.createElement( "div" ) );// Deserialize a standard representationtag = ( rtagName.exec( elem ) || [ "", "" ] )[ 1 ].toLowerCase();wrap = wrapMap[ tag ] || wrapMap._default;tmp.innerHTML = wrap[ 1 ] + jQuery.htmlPrefilter( elem ) + wrap[ 2 ];// Descend through wrappers to the right contentj = wrap[ 0 ];while ( j-- ) {tmp = tmp.lastChild;}// Support: Android <=4.0 only, PhantomJS 1 only// push.apply(_, arraylike) throws on ancient WebKitjQuery.merge( nodes, tmp.childNodes );// Remember the top-level containertmp = fragment.firstChild;// Ensure the created nodes are orphaned (#12392)tmp.textContent = "";}}}// Remove wrapper from fragmentfragment.textContent = "";i = 0;while ( ( elem = nodes[ i++ ] ) ) {// Skip elements already in the context collection (trac-4087)if ( selection && jQuery.inArray( elem, selection ) > -1 ) {if ( ignored ) {ignored.push( elem );}continue;}contains = jQuery.contains( elem.ownerDocument, elem );// Append to fragmenttmp = getAll( fragment.appendChild( elem ), "script" );// Preserve script evaluation historyif ( contains ) {setGlobalEval( tmp );}// Capture executablesif ( scripts ) {j = 0;while ( ( elem = tmp[ j++ ] ) ) {if ( rscriptType.test( elem.type || "" ) ) {scripts.push( elem );}}}}return fragment;}