jQuery.clean使用方法及思路分析

         _default: [ 0, “”, “” ]
     },
     rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([w:]+)[^>]*)/>/gi,
     rtagName = /<([w:]+)/,
     rtbody = /<tbody/i,
     rhtml = /<|&#?w+;/,
     rleadingWhitespace = /^s+/,
     rcheckableType = /^(?:checkbox|radio)$/,
     rscriptType = //(java|ecma)script/i;
 // 设置复选框checkbox或单选框radio表单元素的默认选中状态
 function fixDefaultChecked( elem ) {
     if ( rcheckableType.test( elem.type ) ) {
         elem.defaultChecked = elem.checked;
     }
 }
 // 创建一个安全的文档碎片
 function createSafeFragment( document ) {
     var list = nodeNames.split( “|” ),
     safeFrag = document.createDocumentFragment(); // ie6,7,8浏览器把safeFrage作为HTMLDocument类型
     // 针对ie9以下浏览器
     if ( safeFrag.createElement ) {
         while ( list.length ) {
             safeFrag.createElement(
                 list.pop()
             );
         }
     }
     return safeFrag;
 }
 // 模拟ES5中Array的新功能
 // 该函数API：http://www.css88.com/jqapi-1.8/#p=jQuery.grep
 jQuery.extend({
     grep: function( elems, callback, inv ) {
         var retVal,
             ret = [],
             i = 0,
             length = elems.length;
         inv = !!inv;
         // Go through the array, only saving the items
         // that pass the validator function
         for ( ; i < length; i++ ) {
             retVal = !!callback( elems[ i ], i );
             if ( inv !== retVal ) {
                 ret.push( elems[ i ] );